Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang hai » dang khai, hang hai, dung hai
ban dang » ban hang, ban dan, van dang
cao duc » dao duc, cao suc, giao duc
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ((xay hoi) or (tay hoi)). hieu ve ((cao duc) or (pham duc)) ban dang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((xay hoi) OR (tay hoi)). hieu ve ((cao duc) OR (pham duc)) ban dang hai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((xay hoi) or (tay hoi)). hieu ve ((cao duc) or (pham duc)) ban dang hai cua tre*.