Perhaps you should try some spelling variations:
nghien hieu » nghiep hieu, nghe hieu, thien hieu
nganh nong » nganh cong
sach hoc » cach hoc, sach hoi, mach hoc
khoa cau » khoa chau, khoa cam, hoa cau
cau phan » chau phan, cuu phan, cac phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
mon hoc » toan hoc, dong hoc
thon xa » thong xa, thoi xa, thong xay
xa khoa » da khoa, bia khoa, tai khoa
mo hoc » co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien hieu ((mon hoc) or (mo hoc)) nganh nong thon xa khoa cau phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien hieu ((mon hoc) OR (mo hoc)) nganh nong thon xa khoa cau phan van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien hieu ((mon hoc) or (mo hoc)) nganh nong thon xa khoa cau phan van*.