Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va vanh » va van, va hanh, va anh
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

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