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Try creating a new module

In your config.xml

...
<adminhtml>
    <global_search>
        <magepal_custom_attributes>
            <class>MagePal_GlobalAttributesSearch_Model_Search_Customattributes</class>
            <acl>magepal_globalattributessearch</acl>
        </magepal_custom_attributes>
    </global_search>
</adminhtml> 
    ...

in app/code/local/MagePal/GlobalAttributesSearch/Model/Search/Customattributes.php <?php class MagePal_GlobalAttributesSearch_Model_Search_Customattributes extends Varien_Object { /** * Load search results * */ public function load() { $arr = array(); $searchText = $this->getQuery();

         if(is_int($searchText)){
            search for int in collection

          }
          else{
              search other db table

           }

        // move code above to your if statement and do your db lookup accordingly 
        $collection = Mage::getModel('module/name')->getCollection()
            ->addFieldToFilter(
                array('field_name',),
                array(
                    array('like'=>'%'.$searchText.'%'), 
                    )
                )
            ->load();

        foreach ($collection as $model) {
            $arr[] = array(
                'id'            => 'path/1/'.$model->getId(),
                'type'          => Mage::helper('adminhtml')->__('Custom Attributes'),
                'name'          => $model->getId(),
                'description'   => Mage::helper('core/string')->truncate('desc', 35),
                'url' => Mage::helper('adminhtml')->getUrl('*/path/edit', array('id'=>$model->getId())),
            );
        }

        $this->setResults($arr);
        return $this;
    }
}

See http://blog.mattstephens.co.uk/post/27326981315/adding-custom-module-to-magentos-admin-global-search