whois tuoitho.edu.vn)[Lien

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

tuoitho.edu.vn)[Lien

checking....tuoitho.edu.vn)[Lien
$ whois tuoitho.edu.vn)[Lien
No whois server is known for this kind of object.