Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
mai choi » bai choi, mai khoi, ai choi
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
hoc mai » hoc ma, hoc dai, hoc bai
choi va » hoi va, chai va, cho va
nha van » nha lanh
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 mach hoc tap, nghien cuu mo hoc nganh khoa hoc mai choi va ((nha van) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu mo hoc nganh khoa hoc mai choi va ((nha van) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mo hoc nganh khoa hoc mai choi va ((nha van) or (nhan dan))*.