Perhaps you should try some spelling variations:
gian lan » gian lang, gian dan, giang van
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va gian » va gianh, van gian, va giai
lan cua » lang cua, ban cua, lai cua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty sang ((xa hoi) or (ma hoa)). hieu ve cao duc va gian lan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty sang ((xa hoi) OR (ma hoa)). hieu ve cao duc va gian lan cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty sang ((xa hoi) or (ma hoa)). hieu ve cao duc va gian lan cua tre*.