Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
so sach » so sanh, bo sach, co sach
va vanh » va van, va danh, va hanh
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, vu cham
lai hoi » dai hoi, lai hoa, lai roi
ty sang » ty xang, ty hang, duy sang
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty sang ((lai hoi) or (xa hoi)). hieu ((ve cham) or (ve cac)) xuc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty sang ((lai hoi) OR (xa hoi)). hieu ((ve cham) OR (ve cac)) xuc va vanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty sang ((lai hoi) or (xa hoi)). hieu ((ve cham) or (ve cac)) xuc va vanh dai cua tre*.