Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh doanh » hanh doanh, chinh doanh, doanh doanh
nhan khong » nhan thong, nhanh chong, nganh khong
cong thanh » dong thanh, cong trinh, cong tan
doi chieu » doc hieu, doi chi, ho chieu
chinh can » chinh ca, chinh ban, chinh cau
cong san » cong tac

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 doanh nhan khong ((cong san) or (cong thanh)) chinh can~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh doanh nhan khong ((cong san) OR (cong thanh)) chinh can.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh doanh nhan khong ((cong san) or (cong thanh)) chinh can*.