<http://schema.org/contactType>
"customer service"^^<http://www.w3.org/2001/XMLSchema#string>
<http://thammynangnguc.vn/tu-van-nang-nguc-chay-xe/6-cau-hoi-can-dat-ra-truoc-khi-ban-nang-nguc-noi-soi.html>