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
mai choi » bai choi, mai khoi, ai choi
gian dan » gian lang
tu hach » tu hanh, tu cach, tu sach
hoc mai » hoc ma, hoc dai, hoc bai
choi va » hoi va, chai va, cho va
nhan va » nhan tai, nhan dan, nhan tao
cuu co » huu co, cua co, cuu mo

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 co hoc nganh khoa hoc mai choi va ((nhan va) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hach hoc tap, nghien cuu co hoc nganh khoa hoc mai choi va ((nhan va) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cuu co hoc nganh khoa hoc mai choi va ((nhan va) or (gian dan))*.