Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nganh khoa » nganh hoa, doanh khoa, anh khoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
tu mach » tu cach, tu manh, tu hach
va pham » van pham, va phat, va phap
hoc xa » hoc ma

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 toan hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va pham van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu toan hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi va pham van.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu toan hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va pham van*.