Perhaps you should try some spelling variations:
thanh huong » thanh cong, anh huong, thanh tung
thanh hung » thanh tung, thanh trung, thanh cong
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
hieu cac » hieu va, hieu van, vien cac
hieu luc » hieu luat, hieu qua
cong san » cong tac
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu cac) OR (hieu luc)) - ((thanh hung) or (thanh huong)) cua nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu cac) OR (hieu luc)) - ((thanh hung) OR (thanh huong)) cua nhung cong san van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu cac) OR (hieu luc)) - ((thanh hung) or (thanh huong)) cua nhung cong san van ban*".