Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
sach thi » sach thu, sach tai, sach tham
va doanh » van doanh, vay doanh, va danh
cua viet » ca viet, hoa viet, cua vat
hanh vu » hanh vi, hanh va, hanh tu
va cham » va chat, va tham
cham tu » pham tu, cam tu, chai tu
ban cua » ban quan
vu hai » su hai, vu ha

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach thi) OR (sach thieu)) hanh vu hai. lieu va cham tu va doanh ban cua viet~.
• Adding a wildcard symbol may retrieve word variants: thu ((sach thi) or (sach thieu)) hanh vu hai. lieu va cham tu va doanh ban cua viet*.