Perhaps you should try some spelling variations:
sach tham » sach nha
van doanh » toan doanh, van dong, van thanh
doanh van » doan van, doanh va, doanh ban
va triet » va thiet, va trien, ve triet
hanh vu » hanh vi, hanh va, hanh tu
cam thu » nam thu, cac thu, ca thu
thu van » thuc van, thuy van, tu van
vu hai » su hai, vu ha
va cam » va cham, va cac, va cao
van va » van vat, van van, ban va

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 tham) OR (sach thieu)) hanh vu hai. lieu va cam thu van doanh van va triet~.
• Adding a wildcard symbol may retrieve word variants: thu ((sach tham) or (sach thieu)) hanh vu hai. lieu va cam thu van doanh van va triet*.