Perhaps you should try some spelling variations:
nganh nong » nganh cong
hoc nganh » hoc nhanh
van thanh » ban thanh
sach hoi » sach doi, sach moi, cach thoi
nong hoc » dong hoc, nang hoc, nong thon
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ma hai » ta hai, va hai, xa hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi trac, nghien cuu mon hoc nganh nong hoc ma hai ((van thanh) OR (van tuan)) van~.
• Adding a wildcard symbol may retrieve word variants: tu sach hoi trac, nghien cuu mon hoc nganh nong hoc ma hai ((van thanh) or (van tuan)) van*.