Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chau tinh » cuu tinh, ha tinh, cua tinh
chua bang » chu bang, chua xang, thuat bang
chua nang » chuc nang, chua xang, kha nang
hanh han » hanh nhan, hanh phan, hanh san
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 han ((chua bang) or (chua nang)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chau tinh)) - hanh han ((chua bang) OR (chua nang)) cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chau tinh)) - hanh han ((chua bang) or (chua nang)) cong dan toan cau*.