Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh phan » thanh pho, thanh san, thanh hai
thanh toan » thanh hoa, thanh san, tinh toan
hoc doanh » hoa doanh, hoc danh, hoc dan
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
su mach » su sach
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 dong hoc doanh khoa hoc xa hoi va ((thanh phan) or (thanh toan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu dong hoc doanh khoa hoc xa hoi va ((thanh phan) OR (thanh toan)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu dong hoc doanh khoa hoc xa hoi va ((thanh phan) or (thanh toan))*.