Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
van cac » van hac, van cau, van bac
dan ban » van ban, can ban, dan ba
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ly nang) or (ly hang)) x hoi. hieu van cac dan ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) x hoi. hieu van cac dan ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) or (ly hang)) x hoi. hieu van cac dan ban thanh dai cua tre*.