Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh toan » thanh hoa, thanh san
cac doanh » cac dan, cac dang, van doanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong cac » cuong cac, cong tac, cong cau
khoa hoc » hoa hoc
su mach » su sach
hoi dan » hoa dan, hoc dan, hoi dap
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 cuu cong cac doanh khoa hoc xa hoi dan ((thanh toan) or (tinh toan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu cong cac doanh khoa hoc xa hoi dan ((thanh toan) OR (tinh toan)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu cong cac doanh khoa hoc xa hoi dan ((thanh toan) or (tinh toan))*.