Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cao duc » dao duc, cao suc, giao duc
dinh ve » dinh ket, dinh van
dinh vi » dinh viet, dinh tri, dinh thi
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cao » va cao, ve bao, ve cac

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