Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh manh » lanh manh, canh tranh, van manh
cong nong » cong dong, cong cong, cong trong
nong dan » cong dan, nong san, nguong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((trieu tinh) or (chieu sach)) - ((canh manh) OR (cach mang)) cua cong nong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((trieu tinh) OR (chieu sach)) - ((canh manh) OR (cach mang)) cua cong nong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((trieu tinh) or (chieu sach)) - ((canh manh) OR (cach mang)) cua cong nong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((trieu tinh) or (chieu sach)) - ((canh manh) OR (cach mang)) cua cong nong dan toan ban*.