Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
van cac » van hac, van cau, van bac
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cuu tre, cua triet, dua tren
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
te sai » te tai, te bai, te hai
toc va » hoc va, toc ta, tuc va
te lai » te tai, te bai
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 sai) OR (te lai)) ky tang ma hoa. hieu van cac toc va doanh van ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sai) or (te lai)) ky tang ma hoa. hieu van cac toc va doanh van ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((te sai) or (te lai)) ky tang ma hoa. hieu van cac toc va doanh van ((cua tre) OR (cua te))*.