Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tang quan » nang quan, tong quan, thong quan
tang luan » dung luan
hoi hieu » hoi phieu, hoi tieu, moi hieu
cong tac » cong ty
tac pham » thuc pham, san pham
pham cau » phan cau, pham ca, pham can
ho hieu » ho chieu, nho hieu, co hieu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - hanh ((tang quan) OR (tang luan)) nhung cong tac pham cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoi hieu)) lang - hanh ((tang quan) OR (tang luan)) nhung cong tac pham cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - hanh ((tang quan) OR (tang luan)) nhung cong tac pham cau*.