Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, doanh khoa, anh khoa
mach hoc » cach hoc, dich hoc, anh hoc
cua toan » cuu toan, xuan toan, cua thanh
phan tan » phan van, phan tap, phan lan
tu mach » tu cach, tu manh, tu hach
va phan » van phan, 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 cua toan khoa ((nganh khoa) OR (nganh khong)) hoc xa hoi va phan tan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien cua toan khoa ((nganh khoa) OR (nganh khong)) hoc xa hoi va phan tan".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cua toan khoa ((nganh khoa) OR (nganh khong)) hoc xa hoi va phan tan*.