Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
manh hung » anh huong
doi hieu » doi chieu, doc hieu, doi hien
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
than cau » toan cau, phan cau, than cap
toan cao » toan ban, toan tap
hung va » huong va, hung van, hang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi hieu lang - manh hung va nhung ((cong dan) or (cong tac)) ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - manh hung va nhung ((cong dan) OR (cong tac)) ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - manh hung va nhung ((cong dan) or (cong tac)) ((than cau) or (toan cao))*.