Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tu cach » tu cac
cau luc » cau truc, cau phuc
cap van » cac van, cao van, tap van
cap can » cap han, tap can, cap bang
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
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: ((tu cach) OR (thuoc sach)) ky nang x hoi. hieu va cau luc ((cap can) OR (cap van)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ky nang x hoi. hieu va cau luc ((cap can) OR (cap van)) dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuoc sach)) ky nang x hoi. hieu va cau luc ((cap can) OR (cap van)) dai cua tre*.