Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
trang luan » tang luan, tranh luan, trang tuan
luan nhung » luan chung, luan hung, quan nhung
chau tinh » cuu tinh, ha tinh, cua tinh
toan cau » toan cao, toan ban, toan tap

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

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