Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
va doanh » van doanh, va danh, hoa doanh
dang xay » dang van, van xay
lang van » dang van, tang van, hoang van
te sach » toc sach
dan cua » dan ca, ban cua, dai cua
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
sach ky » sac ky, sach y, sach ty
cua tu » cua tuc, cua su, cua cu

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