Perhaps you should try some spelling variations:
sach kem » hanh kem
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
ban anh » ban hanh, ban banh, ban danh
duc ban » duc tan, duc van, dua ban
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
anh vi » hanh vi, anh va, anh ve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach kem) or (cac ky)) nang xa hoi. hieu van cao duc ban anh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (cac ky)) nang xa hoi. hieu van cao duc ban anh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (cac ky)) nang xa hoi. hieu van cao duc ban anh vi ((cua tre) or (cuu tre))*.