Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thi hang » thi hanh, thi nang, thi hong
van cac » van hac, van cau, van bac
ty hang » ly hang, ty xang, thu hang
cua tre » cua te, cuu tre, cua triet
du gia » duc gia, dau gia, vu gia
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 (thi hang)) x hoi. hieu van cac du gia ((thanh dai) OR (thanh tai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty hang) OR (thi hang)) x hoi. hieu van cac du gia ((thanh dai) or (thanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty hang) OR (thi hang)) x hoi. hieu van cac du gia ((thanh dai) or (thanh tai)) cua tre*.