Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
cong thanh » dong thanh, cong trinh, cong tan
hieu lang » chieu sang, hieu quang, nhieu tang
cong sang » cong san, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
hop hieu » hop nhieu, hoi hieu, hoc thieu
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hop hieu lang - thanh cong thanh thong ((cong sang) or (cong lang)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hop hieu lang - thanh cong thanh thong ((cong sang) OR (cong lang)) khan cap.
• Adding a wildcard symbol may retrieve word variants: hop hieu lang - thanh cong thanh thong ((cong sang) or (cong lang)) khan cap*.