Perhaps you should try some spelling variations:
nghien huy » nghien cuu, nguyen huy, nghiep quy
nganh khoa » nganh hoa, nganh khong, doanh khoa
goc nganh » hoc nganh, hoc nhanh, cac nganh
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
gian dan » gian lang
tu mach » tu cach, tu manh, tu hach
hoc tai » hoc dai, hoc tap, hoc bai
huy mot » huu mot, chua mot, huoc mot
nhan va » nhan tai, nhan dan, nhan tao
ma hoi » mai hoi, xa hoi, ma hoa

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 tai, nghien huy mot goc nganh khoa hoc ma hoi va ((nhan va) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tai, nghien huy mot goc nganh khoa hoc ma hoi va ((nhan va) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tai, nghien huy mot goc nganh khoa hoc ma hoi va ((nhan va) or (gian dan))*.