Perhaps you should try some spelling variations:
tuan hoang » quan hoang, tran hoang, xuan hoang
ban thanh » ban hanh
cong vang » cong lang, cong quang, cong ngang
ban hang » ngan hang
tranh va » tranh van, trang va, trinh va
cong van » cong san, song van, cong tan
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 hang)) - canh tranh va dung ((cong van) or (cong vang)) tuan hoang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((ban thanh) OR (ban hang)) - canh tranh va dung ((cong van) OR (cong vang)) tuan hoang*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((ban thanh) OR (ban hang)) - canh tranh va dung ((cong van) or (cong vang)) tuan hoang*".