whois xetaihanoi.edu.vn)[Xe

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

xetaihanoi.edu.vn)[Xe

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