Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
thu sach » tu sach, thuat sach, thuoc sach
qua cac » cua cac
tuc gia » tac gia, toc gia, luc gia
duc gia » quoc gia
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((x hoi) or (o hoi)). hieu qua cac ((tuc gia) or (duc gia)) thanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((x hoi) OR (o hoi)). hieu qua cac ((tuc gia) OR (duc gia)) thanh dan cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((x hoi) or (o hoi)). hieu qua cac ((tuc gia) or (duc gia)) thanh dan cua tre*.