whois doctormezo.com.vn/gioi-thieu

Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)

doctormezo.com.vn/gioi-thieu

checking....doctormezo.com.vn/gioi-thieu
$ whois doctormezo.com.vn/gioi-thieu
No whois server is known for this kind of object.