Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
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: doi chieu sach - ((canh tranh) or (thanh trung)) va dung cong ((dan than) OR (van than)) man~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((canh tranh) OR (thanh trung)) va dung cong ((dan than) OR (van than)) man*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((canh tranh) or (thanh trung)) va dung cong ((dan than) OR (van than)) man*".