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
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
luc ca » luc cao, luc cua, luc va
ca can » cua can, cap can, ca dan
x hoi » o hoi, x ho, 5 hoi

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