Perhaps you should try some spelling variations:
nghien hau » nghien cuu, nghiep ha, nghiep cau
nganh nong » nganh cong
sach hoc » cach hoc, sach hoi, mach hoc
toan hoc » toan khoa, van hoc, hoa hoc
nong hoc » dong hoc, nang hoc, nong thon
khoa cau » khoa chau, khoa cam, hoa cau
cau phan » chau phan, cuu phan, cac phan
phan van » pham van, thanh van, luan van
su sach » so sach, vu sach
mon hoc » dong hoc
xa khoa » da khoa, bia khoa, tai khoa
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoc tap, nghien hau ((mon hoc) OR (toan hoc)) nganh nong hoc xa khoa cau phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien hau ((mon hoc) OR (toan hoc)) nganh nong hoc xa khoa cau phan van".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien hau ((mon hoc) OR (toan hoc)) nganh nong hoc xa khoa cau phan van*.