Perhaps you should try some spelling variations:
nghien huy » nghien cuu, nguyen huy, nghiep quy
nganh dong » nganh cong, nhanh dong, nganh nong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
thuoc lai » thuoc tai, thuoc la, thuoc sai
mach hoc » cach hoc, dich hoc, bac hoc
huy toan » huy tran, huu toan, huy hoang
toan hoc » toan khoa, van hoc, hoa hoc
cac nhan » ca nhan, cac nha, cam nhan
nhan dan » phan dau, gian dan, nhan tai
anh hoc » sinh hoc, benh hoc, hinh hoc
lai hoi » dai hoi, lai hoa, lai roi
hoi cac » hoc cac, voi cac, hoa cac

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) or (anh hoc)) tap, nghien huy toan hoc nganh dong thuoc lai hoi cac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (anh hoc)) tap, nghien huy toan hoc nganh dong thuoc lai hoi cac nhan dan*.