Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh dan » doanh ban, doanh van, doanh dao
hieu van » hieu va, thien van, lieu va
cac thoi » cac toi, cac hop, cac tro
te sach » toc sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac toc » cac toi, cac nuoc
sach ky » sac ky, sach y, sach ty
cua tu » cua tuc, cua cu, cua te
cua su » qua 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 xa hoi. hieu van ((cac toc) OR (cac thoi)) van doanh dan ((cua tu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. hieu van ((cac toc) or (cac thoi)) van doanh dan ((cua tu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. hieu van ((cac toc) or (cac thoi)) van doanh dan ((cua tu) OR (cua su))*.