Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
luan cong » luat cong, luong cong, luan chung
cong cong » cong dong, trong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
tac than » tac thanh, tac nhan, bac thanh
tam than » ban than
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (doi chi)) xanh - canh tranh luan cong cong ((tac than) or (tam than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chi)) xanh - canh tranh luan cong cong ((tac than) OR (tam than)) cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chi)) xanh - canh tranh luan cong cong ((tac than) or (tam than)) cau*.