Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh doanh
doanh dao » doanh bao, doanh cao, doanh giao
hieu van » hieu va, thien van, hieu ve
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cac toc » cac toi, cac nuoc, cac thoi
toc ta » toc tay, toc thai
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 tang xa hoi. ((hieu van) OR (lieu va)) cac toc ta ((doanh dan) OR (doanh dao)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. ((hieu van) OR (lieu va)) cac toc ta ((doanh dan) or (doanh dao)) cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. ((hieu van) OR (lieu va)) cac toc ta ((doanh dan) or (doanh dao)) cua te*.