Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chau tinh » cuu tinh, ha tinh, cua tinh
dung cong » dung trong
chinh can » chinh ca, chinh ban, chinh cau
tranh su » trinh su, trang su, tranh cua
cong dan » cong san, cong tan, huong dan
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) or (chau tinh)) - canh tranh su dung cong dan ((chan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chau tinh)) - canh tranh su dung cong dan ((chan cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (chau tinh)) - canh tranh su dung cong dan ((chan cau) or (chinh can))*.