Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
cong nong » cong dong, cong cong, cong trong
hang tai » hang va, dung tai
nong dan » cong dan, nong san, nguong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
hang ca » hang va, nang cao, hang dau

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) or (chiet tach)) - hanh ((hang ca) OR (hang tai)) cong nong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - hanh ((hang ca) OR (hang tai)) cong nong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chiet tach)) - hanh ((hang ca) OR (hang tai)) cong nong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - hanh ((hang ca) OR (hang tai)) cong nong dan toan ban*.