Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
cua thong » cua thuong, cua khong, cua tong
tang cua » mang cua, hang cua, tang luan
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
chuc » thuc, chu, chua

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 (chuc nang)) - hanh tang cua thong ((cong dan) OR (cong tan)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chuc nang)) - hanh tang cua thong ((cong dan) OR (cong tan)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (chuc nang)) - hanh tang cua thong ((cong dan) OR (cong tan)) than cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chuc nang)) - hanh tang cua thong ((cong dan) OR (cong tan)) than cau*.