Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
mach hoc » cach hoc, dich hoc, anh hoc
cua toan » cuu toan, xuan toan, cua thanh
toan hoc » van hoc, hoa hoc, tin hoc
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
su mach » su sach
hoi van » hoi va, hoi dan, hai van
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: su mach hoc tap, nghien cua toan hoc toan khoa hoc xa hoi van ((nhan dan) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cua toan hoc toan khoa hoc xa hoi van ((nhan dan) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cua toan hoc toan khoa hoc xa hoi van ((nhan dan) or (phan tu))*.