Perhaps you should try some spelling variations:
dang khai » dang khoi, quang khai, dang thi
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
dang hai » hang hai, dung hai, dong hai
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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 ((cao duc) or (pham duc)) ban ((dang hai) OR (dang khai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. hieu ve ((cao duc) OR (pham duc)) ban ((dang hai) OR (dang khai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. hieu ve ((cao duc) or (pham duc)) ban ((dang hai) OR (dang khai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu ve ((cao duc) or (pham duc)) ban ((dang hai) OR (dang khai)) cua tre*.