Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
van cac » van hac, van cau, van bac
thi van » thi lan, thi hanh, thi nang
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
ky lang » ky nang, ky dang, ky tang
toc va » hoc va, toc ta, tuc va
cua tu » cua tuc, cua su, cua te
cua cu » cua chu, cua cau, cua su

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: te sach ky lang ((van hoi) OR (van hoc)). thi van cac toc va doanh dan ((cua tu) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((van hoi) OR (van hoc)). thi van cac toc va doanh dan ((cua tu) or (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((van hoi) OR (van hoc)). thi van cac toc va doanh dan ((cua tu) or (cua cu))*.