Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
va doanh » van doanh, vay doanh, va danh
cac thoi » cac toi, cac hop, cac tro
te sach » toc sach
sach ky » sac ky, sach y, sach ty
dan cua » dan ca, ban cua, dai cua
cac toc » cac toi, cac nuoc
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua te » cua tu

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