Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
ty hang » ly hang, thi hang, thu hang
ban duc » ban duoc, van duc, ban dac
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty hang) OR (ty xang)) x hoi. hieu van ban duc va thanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty hang) or (ty xang)) x hoi. hieu van ban duc va thanh dai cua tre*.