<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.omt.vn/index.php?option=com_content&view=article&id=353%3Adu-hoc-my&catid=34%3Ad-an&Itemid=178&lang=vi>