Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua
manh cua » doanh cua, ban cua
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh ((tranh cua) or (manh cua)) nhung cong tan ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((tranh cua) OR (manh cua)) nhung cong tan ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((tranh cua) or (manh cua)) nhung cong tan ((than cau) or (than cap))*.