Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nong » nganh cong
nong thuoc » dong thuoc, long thuoc, khong thuoc
goc nganh » hoc nganh, hoc nhanh, cac nganh
cach hoc » cach thuc, cach thoi, dich hoc
thuoc xa » thuoc ma, thuoc va, thuoc la
thai van » thi van, thanh van, thai vung
tu cach » tu cac
huu mot » cuu mot, huy mot, hieu mot
hoi van » hoi va, hoi dan, hai van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach hoc tap, nghien huu mot goc nganh nong thuoc xa ((hoi van) or (thai van)) von tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach hoc tap, nghien huu mot goc nganh nong thuoc xa ((hoi van) OR (thai van)) von tai.
• Adding a wildcard symbol may retrieve word variants: tu cach hoc tap, nghien huu mot goc nganh nong thuoc xa ((hoi van) or (thai van)) von tai*.