Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
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 cuu » hai cua, hai chu, hai cuc
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo

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 ky dang xay hoi. ((hieu ve) or (hieu va)) ((cao duc) or (pham duc)) ban dang hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. ((hieu ve) OR (hieu va)) ((cao duc) OR (pham duc)) ban dang hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. ((hieu ve) or (hieu va)) ((cao duc) or (pham duc)) ban dang hai cuu tre*.