Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
san toan » van toan, manh toan, xuan toan
dan toan » van toan, dan than, manh toan
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) or (chieu tinh)) - canh tranh va dung cong ((san toan) OR (dan toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chieu tinh)) - canh tranh va dung cong ((san toan) OR (dan toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chieu tinh)) - canh tranh va dung cong ((san toan) OR (dan toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chieu tinh)) - canh tranh va dung cong ((san toan) OR (dan toan)) cau*.