diff --git a/admin/themes/default/items/search-form.php b/admin/themes/default/items/search-form.php
index c092e8607c..d5546d3ab4 100755
--- a/admin/themes/default/items/search-form.php
+++ b/admin/themes/default/items/search-form.php
@@ -132,9 +132,9 @@
             <div class="five columns omega inputs">
             <?php
                 echo $this->formSelect(
-                    'collection',
+                    'collection[]',
                     @$_REQUEST['collection'],
-                    array('id' => 'collection-search'),
+                    array('id' => 'collection-search', 'multiple' => true),
                     get_table_options('Collection', null, array('include_no_collection' => true))
                 );
             ?>
@@ -148,10 +148,10 @@
             <div class="five columns omega inputs">
             <?php
                 echo $this->formSelect(
-                    'type',
+                    'type[]',
                     @$_REQUEST['type'],
-                    array('id' => 'item-type-search'),
-                    get_table_options('ItemType')
+                    array('id' => 'item-type-search', 'multiple' => true),
+                    get_table_options('ItemType', null, array('include_no_item_type' => true))
                 );
             ?>
             </div>
diff --git a/application/models/Table/Item.php b/application/models/Table/Item.php
index c7c6383ad2..0a62cfede8 100644
--- a/application/models/Table/Item.php
+++ b/application/models/Table/Item.php
@@ -197,10 +197,11 @@ public function filterByCollection($select, $collections)
             if (is_numeric($collection)) {
                 return (int) $collection;
             }
-            return;
+            return '';
         }, $collections);
 
-        $hasEmpty = in_array(null, $collectionIds);
+        // strict check to skip placeholder (empty string)
+        $hasEmpty = in_array(null, $collectionIds, true);
         $collectionIds = array_filter($collectionIds);
         if (!empty($collectionIds)) {
             $select->joinLeft(
@@ -245,10 +246,11 @@ public function filterByItemType($select, $types)
             if (is_string($type)) {
                 return $type;
             }
-            return;
+            return '';
         }, $types);
 
-        $hasEmpty = in_array(null, $typeIdsOrNames);
+        // strict check to skip placeholder (empty string)
+        $hasEmpty = in_array(null, $typeIdsOrNames, true);
         $typeIdsOrNames = array_filter($typeIdsOrNames);
         if ($typeIdsOrNames) {
             $select->joinLeft(array(
diff --git a/application/models/Table/ItemType.php b/application/models/Table/ItemType.php
index 128c425047..14aa25f812 100644
--- a/application/models/Table/ItemType.php
+++ b/application/models/Table/ItemType.php
@@ -22,4 +22,14 @@ public function findByName($itemTypeName)
         $select->where($this->_name . '.name = ?', $itemTypeName);
         return $this->fetchObject($select);
     }
+
+    public function findPairsForSelectForm(array $options = array())
+    {
+        $pairs = parent::findPairsForSelectForm($options);
+
+        if (isset($options['include_no_item_type']) && $options['include_no_item_type']) {
+            $pairs = array(__('No Item Type')) + $pairs;
+        }
+        return $pairs;
+    }
 }
diff --git a/application/views/helpers/ItemSearchFilters.php b/application/views/helpers/ItemSearchFilters.php
index 78ea811a8d..496a2bbca6 100644
--- a/application/views/helpers/ItemSearchFilters.php
+++ b/application/views/helpers/ItemSearchFilters.php
@@ -38,22 +38,39 @@ public function itemSearchFilters(array $params = null)
                 switch ($key) {
                     case 'type':
                         $filter = 'Item Type';
-                        $itemType = $db->getTable('ItemType')->find($value);
-                        if ($itemType) {
-                            $displayValue = $itemType->name;
+                        $value = (array) $value;
+                        $displayValues = array();
+                        $noIndex = array_search('0', $value, true);
+                        if ($noIndex !== false) {
+                            $displayValues[] = __('No Item Type');
+                            unset($value[$noIndex]);
                         }
+                        if (!empty($value)) {
+                            $itemTypes = $db->getTable('ItemType')->findBy(array('id' => $value));
+                            if ($itemTypes) {
+                                $displayValues[] = implode(', ', pluck('name', $itemTypes));
+                            }
+                        }
+                        $displayValue = implode(', ', $displayValues);
                         break;
 
                     case 'collection':
-                        if ($value === '0') {
-                            $displayValue = __('No Collection');
-                            break;
+                        $value = (array) $value;
+                        $displayValues = array();
+                        $noIndex = array_search('0', $value, true);
+                        if ($noIndex !== false) {
+                            $displayValues[] = __('No Collection');
+                            unset($value[$noIndex]);
                         }
-
-                        $collection = $db->getTable('Collection')->find($value);
-                        if ($collection) {
-                            $displayValue = metadata($collection, 'display_title', array('no_escape' => true));
+                        if (!empty($value)) {
+                            $collections = $db->getTable('Collection')->findBy(array('id' => $value));
+                            if ($collections) {
+                                $displayValues[] = implode(', ', array_map(function($collection) {
+                                    return metadata($collection, 'display_title', array('no_escape' => true));
+                                }, $collections));
+                            }
                         }
+                        $displayValue = implode(', ', $displayValues);
                         break;
 
                     case 'user':
diff --git a/application/views/scripts/items/search-form.php b/application/views/scripts/items/search-form.php
index 985c396fab..8b0f024e67 100755
--- a/application/views/scripts/items/search-form.php
+++ b/application/views/scripts/items/search-form.php
@@ -121,9 +121,9 @@
         <div class="inputs">
         <?php
             echo $this->formSelect(
-                'collection',
+                'collection[]',
                 @$_REQUEST['collection'],
-                array('id' => 'collection-search'),
+                array('id' => 'collection-search', 'multiple' => true),
                 get_table_options('Collection', null, array('include_no_collection' => true))
             );
         ?>
@@ -135,10 +135,10 @@
         <div class="inputs">
         <?php
             echo $this->formSelect(
-                'type',
+                'type[]',
                 @$_REQUEST['type'],
-                array('id' => 'item-type-search'),
-                get_table_options('ItemType')
+                array('id' => 'item-type-search', 'multiple' => true),
+                get_table_options('ItemType', null, array('include_no_item_type' => true))
             );
         ?>
         </div>