Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nong » nganh cong
nong thoi » nong thon, nong thi, trong thoi
hoc nganh » hoc nhanh
phan van » pham van, thanh van, luan van
cau phan » chau phan, cuu phan, cac phan
khoa cau » khoa chau, khoa cam, hoa cau
sach hoi » sach doi, sach moi, cach thoi
sach hoc » cach hoc, mach hoc, sach duoc
xa khoa » da khoa, bia khoa, tai khoa
thoi xa » thoi xua, thi xa, thoi va
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc

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) or (sach hoi)) tap, nghien huu mot hoc nganh nong thoi xa khoa cau phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (sach hoi)) tap, nghien huu mot hoc nganh nong thoi xa khoa cau phan van*.