Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
va dao » ca dao

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