Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
doanh khoa » toan khoa
hoc phuong » hoc thuong, cac phuong
khoa khau » khoa kham, khoa phau, khoa chau
sach tien » sach tren, sach thieu
hang khoa » dung khoa
sach bai » sach dao, cac bai, sach xa
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
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
bai tu » tai tu, mai tu, cai tu

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

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