Perhaps you should try some spelling variations:
ban thanh » ban hang
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
tuan bang » tuan dang, tuan hoang, thuat bang
ban hanh » ban hang
tranh va » tranh van, trang va, trinh va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((ban thanh) or (ban hanh)) - canh tranh va dung ((cong vang) OR (cong lang)) tuan bang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((ban thanh) OR (ban hanh)) - canh tranh va dung ((cong vang) OR (cong lang)) tuan bang*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((ban thanh) or (ban hanh)) - canh tranh va dung ((cong vang) OR (cong lang)) tuan bang*".