Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
tranh cao » trinh cao, tranh cac, tranh cai
dang cong » dung cong
thanh cac » hanh cac, thanh bac, tranh cac
cong san » cong tac
thanh ca » thanh cha, thanh ha, thanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - canh tranh cao dang cong san ((thanh cac) or (thanh ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh tranh cao dang cong san ((thanh cac) OR (thanh ca)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh tranh cao dang cong san ((thanh cac) or (thanh ca))*.