Perhaps you should try some spelling variations:
viet thanh » viet anh
nhung cong » dung cong, thong cong, hang cong
viet tach » viet sach, viet tech, chiet tach
cua nhung » va nhung
cong cua » cong cu, dong cua, huong cua
cong ban » cong bang, cong san, cong tan
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: khoa ((viet tach) or (viet thanh)) - thanh cong cua nhung cong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoa ((viet tach) OR (viet thanh)) - thanh cong cua nhung cong ban than cau.
• Adding a wildcard symbol may retrieve word variants: khoa ((viet tach) or (viet thanh)) - thanh cong cua nhung cong ban than cau*.