Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
cac duc » cac du, cao duc, cac dac
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
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: ((te sach) OR (((toc sach) OR (doc sach)))) ky nang x hoi. hieu ve cac duc ban thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((toc sach) OR (doc sach)))) ky nang x hoi. hieu ve cac duc ban thanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((toc sach) OR (doc sach)))) ky nang x hoi. hieu ve cac duc ban thanh tai cua tre*.