Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh khoa
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nong » nganh cong
sach hoc » cach hoc, sach hoi, mach hoc
mai khoi » mai khoa, tai khoa, cac khoi
khoi cua » hoi cua, khi cua, kho cua
cua nhan » ca nhan, cua ngan, cua nha
nhan van » nhan dan, nhan va, phan van
te sach » toc sach
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hoc mai » hoc ma, hoc dai, hoc bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach hoc tap, nghien huu mot hoc ((nganh khong) or (nganh nong)) hoc mai khoi cua nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien huu mot hoc ((nganh khong) OR (nganh nong)) hoc mai khoi cua nhan van.
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien huu mot hoc ((nganh khong) or (nganh nong)) hoc mai khoi cua nhan van*.