Index: branches/version-2_11-dev/data/class/pages/admin/order/LC_Page_Admin_Order.php
===================================================================
--- branches/version-2_11-dev/data/class/pages/admin/order/LC_Page_Admin_Order.php	(revision 20764)
+++ branches/version-2_11-dev/data/class/pages/admin/order/LC_Page_Admin_Order.php	(revision 20789)
@@ -269,5 +269,5 @@
 
         case 'search_product_name':
-            $where .= " AND (SELECT COUNT(*) FROM dtb_order_detail od WHERE od.order_id = dtb_order.order_id AND od.product_name LIKE ?) > 0";
+            $where .= " AND EXISTS (SELECT 1 FROM dtb_order_detail od WHERE od.order_id = dtb_order.order_id AND od.product_name LIKE ?)";
             $arrValues[] = sprintf('%%%s%%', $objFormParam->getValue($key));
             break;