Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
te sach » toc sach
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
luc vay » luc va, luc van, luoc van
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
ky dang » ky danh
ma hoi » mai hoi, xa hoi, ma hoa

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 dang) OR (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc vay doanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc vay doanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) or (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc vay doanh tai cua tre*.