Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (toc sach)) ky nang o hoi. hieu va cam xuc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang o hoi. hieu va cam xuc ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky nang o hoi. hieu va cam xuc ban thanh dai cua tre*.