Perhaps you should try some spelling variations:
dinh tri » chinh tri
te sach » toc sach
sach ty » sach y, sach tu, sach thu
dinh ve » dinh ket, dinh van
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cac dac, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang

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 ty lang xa hoi. hieu ve ((cac duc) OR (cao duc)) va ((dinh tri) OR (dinh ve)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty lang xa hoi. hieu ve ((cac duc) OR (cao duc)) va ((dinh tri) or (dinh ve)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ty lang xa hoi. hieu ve ((cac duc) OR (cao duc)) va ((dinh tri) or (dinh ve)) cua tre*.