Perhaps you should try some spelling variations:
cham xuc » chat xuc, cham soc, pham duc
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
van dai » vanh dai, van dao, van hai
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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 sach y nang ((o hoi) OR (co hoi)). hieu va ((cham xuc) OR (cam xuc)) va van dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((o hoi) or (co hoi)). hieu va ((cham xuc) OR (cam xuc)) va van dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (co hoi)). hieu va ((cham xuc) OR (cam xuc)) va van dai cua tre*.