Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
hang cua » mang cua, huong cua, thong cua
cong tan » cong tac, cong san, cong ty
ho hieu » ho chieu, hoi hieu, nho hieu
hang ca » hang va, nang cao, hang tai
tra cau » tra sau, ta cau, tra cuu

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 ((hang cua) or (hang ca)) nhung ((cong thanh) or (cong tan)) tra cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh ((hang cua) OR (hang ca)) nhung ((cong thanh) OR (cong tan)) tra cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh ((hang cua) or (hang ca)) nhung ((cong thanh) or (cong tan)) tra cau*.