Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
chiet tach » chieu sach
bien tinh » bi tinh, yen tinh, diep tinh
luan tong » luan tuong, luan cong, luan dong
tong cong » trong cong, cong cong, dung cong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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: ho ((chiet tach) OR (bien tinh)) - canh tranh luan tong cong ((dan toan) OR (dan than)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (bien tinh)) - canh tranh luan tong cong ((dan toan) OR (dan than)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (bien tinh)) - canh tranh luan tong cong ((dan toan) OR (dan than)) cao*.