<http://schema.org/query-input>
"required name=search_term_string"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.kilobooks.com/su-dung-phuong-phap-thong-ke-de-tinh-toan-ton-that-nang-luong-tren-luoi-dien-hinh-tia-242931>