Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
luan nang » luan van, van nang, luan san
nang nong » nang song, hang nong, nang dong
dan thanh » dang thanh, danh thanh, ban thanh
thanh hai » thanh phan, thanh hoa, thanh san
nong dan » cong dan, nong san, nguong dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (chiet tach)) - sach dung luan nang nong dan thanh hai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (chiet tach)) - sach dung luan nang nong dan thanh hai.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (chiet tach)) - sach dung luan nang nong dan thanh hai*.