Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh huong
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
tong tac » tuong tac, trong tac, cong tac
toan ban » van ban
ho hieu » ho chieu, hoi hieu, nho hieu
va han » va phan, van han, va hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - ((thanh truong) or (thanh tung)) va han tong tac ((toan tap) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - ((thanh truong) OR (thanh tung)) va han tong tac ((toan tap) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((thanh truong) or (thanh tung)) va han tong tac ((toan tap) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((thanh truong) or (thanh tung)) va han tong tac ((toan tap) OR (toan ban))*.