Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
so hai » son hai, su hai, so ha
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao
o hai » co hai, o lai, _ 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 nang ((o hai) OR (so hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hai) or (so hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hai) or (so hai)). hieu va cam tuc va ((vanh dai) OR (vanh tai)) cua tre*.