Perhaps you should try some spelling variations:
chiet tach » chieu sach
truong cua » truong ca, truong quan, truong cao
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trung cua » trung tuan, trung cap, dung cua
cong nong » cong dong, cong cong, cong trong
nong san » cong san, dong san, nong dan
san van » tan van, luan van, tran van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chiet tach - thanh ((trung cua) or (truong cua)) cong nong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - thanh ((trung cua) OR (truong cua)) cong nong san van ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh ((trung cua) or (truong cua)) cong nong san van ban*.