Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
dac ban » cac ban, dac san, duc ban
van bac » van ban, van bao, van hac
van cac » van hac, van cau, dan cac
te sach » toc sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
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: te sach ((ly nang) or (ly hang)) x hoi. hieu ((van cac) OR (van bac)) dac ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ly nang) OR (ly hang)) x hoi. hieu ((van cac) OR (van bac)) dac ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ly nang) or (ly hang)) x hoi. hieu ((van cac) OR (van bac)) dac ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ly nang) or (ly hang)) x hoi. hieu ((van cac) OR (van bac)) dac ban thanh dai cua tre*.