Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
hach hoc » cach hoc, mach hoc, hoach hoi
khoa hoc » hoa hoc
bai choi » tai chi, bai hoc, bi cho
nhan dan » phan dau, gian dan, nhan tai
tu hach » tu hanh, tu cach, tu sach
hoc bai » hoc dai, hoc giai
choi va » hoi va, chai va, cho va
nhan va » nhan tai, nhan tao, phan van
mo hoc » mon 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 hach hoc tap, nghien cuu mo hoc nganh khoa hoc bai choi va ((nhan va) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hach hoc tap, nghien cuu mo hoc nganh khoa hoc bai choi va ((nhan va) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cuu mo hoc nganh khoa hoc bai choi va ((nhan va) or (nhan dan))*.