Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
lieu tinh » trieu tinh, diep tinh, bien tinh
nhung don » nhung van, nhung bo
dung cong » dung trong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
co lieu » cot lieu, co hieu, so lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co lieu tinh - canh tranh luan ((nhung don) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co lieu tinh - canh tranh luan ((nhung don) OR (dung cong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - canh tranh luan ((nhung don) or (dung cong)) dan toan cao*.