Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
va vanh » va van, va danh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach ty, sach kem
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
s_ hai » su hai, so hai

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: tu ((sach ky) OR (sach y)) nang ((_ hai) OR (s_ hai)). hieu va cam tuc va vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang ((_ hai) or (s_ hai)). hieu va cam tuc va vanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang ((_ hai) or (s_ hai)). hieu va cam tuc va vanh dai cua tre*.