Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
quoc ban » quoc bao, quoc lan, quoc quan
doanh de » doanh dao, doanh ket, doanh va
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve han » ve hanh, ve phan, ve ban
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, 5 hoi

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: tu sach tu nang ((x hoi) OR (x ho)). hieu ve han quoc ban doanh de ((cuu tre) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang ((x hoi) OR (x ho)). hieu ve han quoc ban doanh de ((cuu tre) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((x hoi) OR (x ho)). hieu ve han quoc ban doanh de ((cuu tre) or (cua tu))*.