Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
thanh van » thanh san, thanh toan, thanh phan
doc mach » doc sach, hoc mac, duc manh
mach hoc » cach hoc, dich hoc, anh hoc
cua toan » cuu toan, xuan toan, cua thanh
toan hoc » toan khoa, van hoc, hoa hoc
khoa hoc » hoa hoc
va thanh » gia thanh, ban thanh, va tinh
ma hoi » mai hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc mach hoc tap, nghien cua toan hoc nganh khoa hoc ((ma hoi) or (xa hoi)) va thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc mach hoc tap, nghien cua toan hoc nganh khoa hoc ((ma hoi) OR (xa hoi)) va thanh van.
• Adding a wildcard symbol may retrieve word variants: doc mach hoc tap, nghien cua toan hoc nganh khoa hoc ((ma hoi) or (xa hoi)) va thanh van*.