Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, cua triet
ta hanh » ta thanh, va hanh, tu hanh
ky sang » ky nang, ky dang, ky tang
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
toc ta » toc tay, toc thai
tu san » thu san, tu can, vu san
ma hoi » mai hoi, ma hoa, me hoi
tu ban » thu ban, te ban

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 san) OR (tu ban)) ky sang ((ma hoi) OR (xa hoi)). hieu va cac toc ta hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu san) or (tu ban)) ky sang ((ma hoi) OR (xa hoi)). hieu va cac toc ta hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu san) or (tu ban)) ky sang ((ma hoi) OR (xa hoi)). hieu va cac toc ta hanh dai cua tre*.