Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thanh toan » thanh hoa, thanh san, tinh toan
phan khoa » pham khoa, nhan khoa, phan hoa
thanh van » thanh san, thanh phan, thanh nhan
mach hoc » cach hoc, dich hoc, anh hoc
huu toan » huu tuan, cuu toan, huy toan
toan hoc » toan khoa, van hoc, hoa hoc
hoc phan » hoc dan, hoc pho
khoa hoc » hoa hoc
su mach » su sach
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi

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

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