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
hang nong » thang long, han tong
trinh va » trinh van, trinh vat, trinh ve
nong tan » cong tan, nong dan, nong san
hang dau » hang va, hang tai
va hang » van hang, va nang, va lang

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 hang nong tan ((hang dau) OR (phan tu))~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - canh trinh va hang nong tan ((hang dau) or (phan tu))*.