<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.chotot.com/quan-cau-giay/mua-ban-may-tinh-bang/ipad-mini-2-16gb-wifi-4g-gray-con-bh-fpt-5-12-2016-21938997.htm>