Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hieu van » hieu va, thien van, lieu va
cac thoi » cac toi, cac hop, cac tro
te sach » toc sach
dan cua » dan ca, dai cua, day cua
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
ban cua » ban quan

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) OR (ban cua)) tu~.
• 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) OR (ban cua)) tu~".
• 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) OR (ban cua)) tu*.