Perhaps you should try some spelling variations:
doanh khoa » toan khoa
khau thong » khau thuong, khap thong, khau tong
hoc phuong » hoc thuong, cac phuong
khoa khau » khoa kham, khoa phau, khoa chau
bach tien » sach tien, cach thien, bang tien
hang khoa » dung khoa
sach tai » sach bai, sach tham, sach dao
tu doanh » su doanh, te doanh, ty doanh
tien thu » tieu thu, kien thuc, trien thi
thu hang » thi hang, thuc hanh, thu huong
khoa hoc » hoa hoc
te sach » toc sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tai tu doanh khoa khau thong ) or ( vu bach tien thu hang khoa hoc phuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tai tu doanh khoa khau thong ) OR ( vu bach tien thu hang khoa hoc phuong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tai tu doanh khoa khau thong ) or ( vu bach tien thu hang khoa hoc phuong ))*.