Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nho hieu » nha hieu, nho sieu, nhu hieu
dung cua » dung luan, dung cho
manh cua » doanh cua, ban cua
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi 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 (nho hieu)) quang - hanh ((dung cua) OR (manh cua)) nhung cong tac phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (nho hieu)) quang - hanh ((dung cua) or (manh cua)) nhung cong tac phan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (nho hieu)) quang - hanh ((dung cua) or (manh cua)) nhung cong tac phan cau*.