Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hieu van » thien van, lieu va, hieu ve
va doanh » vay doanh, va danh, hoa doanh
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
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
cao cua » ca cua, co cua, cau cua
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 (hieu va)) cac toc ((va doanh) OR (van doanh)) cao cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. ((hieu van) or (hieu va)) cac toc ((va doanh) OR (van doanh)) cao cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. ((hieu van) or (hieu va)) cac toc ((va doanh) OR (van doanh)) cao cua te*.