Perhaps you should try some spelling variations:
tu cach » tu cac
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
cap can » cap han, cap van, tap can
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
ca can » cua can, ca dan, ca cac
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 cach) OR (tu sach)) ky nang x hoi. hieu va cau luc ((ca can) OR (cap can)) dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) OR (tu sach)) ky nang x hoi. hieu va cau luc ((ca can) OR (cap can)) dai cua tre*.