Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » hanh trinh, hanh trang, lanh tranh
nhung nong » nhung cong, nhung bong, nhung chong
thanh phan » thanh pho, thanh san, thanh toan
doi chieu » doc hieu, doi chi, ho chieu
thanh hai » thanh hoa, thanh san
nong san » cong san, dong san, nong dan

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