Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
doanh khoa » toan khoa
thanh toan » thanh hoa, thanh san, tinh toan
bai thanh » ban thanh, tai thanh, mai thanh
mach hoc » cach hoc, dich hoc, anh hoc
cong hoc » dong hoc, cong coc, cong ho
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
su mach » su sach
hoi bai » hoc bai, hoi tai, khoi bay
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 thu ((cong hoc) or (cong hoa)) doanh khoa hoc xa hoi bai thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien thu ((cong hoc) OR (cong hoa)) doanh khoa hoc xa hoi bai thanh toan.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien thu ((cong hoc) or (cong hoa)) doanh khoa hoc xa hoi bai thanh toan*.