Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tan thanh » tran thanh, tang thanh, toan thanh
thanh cac » hanh cac, thanh bac, thanh ca
doi hieu » doi chieu, doc hieu, doi hien
huong va » thuong va, duong va, muong va
luong va » dung va
cong tan » cong tac, cong san, cong thanh
hung va » hung van, hang va, dung 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) or (((huong va) OR (luong va)))) nhung cong tan thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi hieu lang - manh ((hung va) OR (((huong va) OR (luong va)))) nhung cong tan thanh cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi hieu lang - manh ((hung va) or (((huong va) OR (luong va)))) nhung cong tan thanh cac".
• Adding a wildcard symbol may retrieve word variants: doi hieu lang - manh ((hung va) or (((huong va) OR (luong va)))) nhung cong tan thanh cac*.