<http://schema.org/query-input>
"required name=search_term"^^<http://www.w3.org/2001/XMLSchema#string>
<http://us.24h.com.vn/giao-duc-du-hoc/lop-luyen-thi-dh-cd-cua-co-giao-chuyen-gioi-c216a530997.html>