Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
quan lang » quan hoang, quan luan, quan van
gian lang » gian dan
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 trinh ((quan lang) OR (gian lang)) cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh trinh ((quan lang) OR (gian lang)) cong ((dan toan) OR (van toan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh ((quan lang) OR (gian lang)) cong ((dan toan) or (van toan)) cau*".