Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
van dung » van dong, xay dung, tin dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 - ((hanh tranh) or (hanh trinh)) van dung cong ((dan toan) OR (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((hanh tranh) OR (hanh trinh)) van dung cong ((dan toan) OR (dan than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - ((hanh tranh) or (hanh trinh)) van dung cong ((dan toan) OR (dan than)) ban".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((hanh tranh) or (hanh trinh)) van dung cong ((dan toan) OR (dan than)) ban*.