Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh doanh
doanh dao » doanh bao, doanh cao, doanh giao
toc sach » hoc sach, doc sach, thuoc sach
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tu lang » cu lang, tu lanh, xu lang
toc va » hoc va, toc ta, tuc va
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) OR (toc sach)) tu lang xa hoi. hieu va cac toc va ((doanh dan) OR (doanh dao)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu lang xa hoi. hieu va cac toc va ((doanh dan) or (doanh dao)) cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) tu lang xa hoi. hieu va cac toc va ((doanh dan) or (doanh dao)) cua te*.