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
toan cao » toan tap
toan ban » van ban
ho lieu » so lieu, co lieu, ho kieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho lieu tinh - canh tranh luan ((nhung don) or (dung cong)) dan ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu tinh - canh tranh luan ((nhung don) OR (dung cong)) dan ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho lieu tinh - canh tranh luan ((nhung don) or (dung cong)) dan ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho lieu tinh - canh tranh luan ((nhung don) or (dung cong)) dan ((toan cao) OR (toan ban))*.