Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
ho chieu » theo chieu, hoc thieu, doi chieu
hoi hieu » hoi phieu, hoi tieu, moi hieu
tang cua » mang cua, hang cua, thong cua
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu

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 chieu) OR (hoi hieu)) lang - hanh ((tang cua) OR (tang luan)) nhung cong tac phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoi hieu)) lang - hanh ((tang cua) OR (tang luan)) nhung cong tac phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoi hieu)) lang - hanh ((tang cua) OR (tang luan)) nhung cong tac phan cau*.