Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh nong » nganh cong
nong thuoc » dong thuoc, long thuoc, khong thuoc
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
cong hoc » dong hoc, cong hoa, cong coc
thuoc xa » thuoc ma, thuoc va, thuoc la
phan van » pham van, thanh van, tran van
so sach » so sanh, bo sach, co sach
hoi van » hoi va, hoi dan, hai van
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien cua cong hoc nganh nong thuoc xa hoi van ((phan van) or (luan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien cua cong hoc nganh nong thuoc xa hoi van ((phan van) OR (luan van)).
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cua cong hoc nganh nong thuoc xa hoi van ((phan van) or (luan van))*.