Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh ve » hanh vi, hanh va, hanh kem
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
ve cao » va cao, ve bao, ve cac
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
anh ve » anh va, anh viet, thanh ve

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: thuat sach y sang ((ma hoi) OR (xa hoi)). hieu ve cao duc van ((anh ve) OR (hanh ve)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y sang ((ma hoi) OR (xa hoi)). hieu ve cao duc van ((anh ve) or (hanh ve)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach y sang ((ma hoi) OR (xa hoi)). hieu ve cao duc van ((anh ve) or (hanh ve)) cua tre*.