Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, nhieu tang, hieu van
cua thong » cua thuong, cua khong, cua tong
thanh cha » thanh ha, thanh nha, thanh phan
van manh » van minh, van anh, van hanh
manh cua » doanh cua, ban cua
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac

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: doi ((hieu lang) OR (hieu quang)) - van manh cua thong cong tan ((thanh cha) OR (than cap))~.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (hieu quang)) - van manh cua thong cong tan ((thanh cha) or (than cap))*.