Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
so sach » so sanh, bo sach, co sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
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: so sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) OR (hieu va)) cac luc va thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) or (hieu va)) cac luc va thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) OR (ty hang)) x hoi. ((hieu van) or (hieu va)) cac luc va thanh vai cua tre*.