Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, nhung don
hieu cach » chieu sach, hieu ca, biet cach
tung quan » tuong quan, trung quan, dung quan
hang cong » dang cong, hang nong, bang cong
hieu cac » hieu luc, hieu va, hieu van
dan chan » dan gian, dan ca, van chat
chan cap » khan cap, than cap, cao cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (hieu cac)) - thanh tung quan ((nhung cong) OR (hang cong)) dan chan cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) OR (hieu cac)) - thanh tung quan ((nhung cong) or (hang cong)) dan chan cap~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) OR (hieu cac)) - thanh tung quan ((nhung cong) or (hang cong)) dan chan cap*.