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