Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh dai » danh dau, danh di, danh sai
su sach » so sach, vu sach
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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: ((su sach) OR (thu sach)) ky nang ((x hoi) OR (o hoi)). hieu qua cac duc va danh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang ((x hoi) or (o hoi)). hieu qua cac duc va danh dai cua tre*.