Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
lang van » dang van, tang van, hoang van
te sach » toc sach
cac toc » cac toi, cac nuoc, cac thoi
dan cua » dan ca, ban cua, dai cua
van cua » vang cua, ban cua, nan cua
toc van » hoc van, toc san, tac van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay

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