Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vanh dai » van dai, vanh tai, lanh dao
te sach » toc sach
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac cuoc
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
x hoi » xa hoi, o hoi, x ho

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 ((y nang) OR (ky nang)) x hoi. hieu va ((cac luc) OR (cac nuoc)) va vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (ky nang)) x hoi. hieu va ((cac luc) OR (cac nuoc)) va vanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (ky nang)) x hoi. hieu va ((cac luc) OR (cac nuoc)) va vanh dai cua tre*.