Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
trang tham » trang cham, trang thai, trang thach
tham nhung » thi nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
ran cau » van cau, ban cau, can cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (trieu tinh)) - hanh trang tham nhung ((cong tan) OR (cong san)) ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (trieu tinh)) - hanh trang tham nhung ((cong tan) OR (cong san)) ran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (trieu tinh)) - hanh trang tham nhung ((cong tan) OR (cong san)) ran cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (trieu tinh)) - hanh trang tham nhung ((cong tan) OR (cong san)) ran cau*.