Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
hang dau » hang va, hang tai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - canh trinh va nhung ((cong tan) OR (cong san)) ((hang dau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - canh trinh va nhung ((cong tan) OR (cong san)) ((hang dau) or (phan tu))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh trinh va nhung ((cong tan) OR (cong san)) ((hang dau) or (phan tu))*.