Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
vai cua » dai cua, hai cua, lai cua
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
sach uu » sach luu, sach tu, sach xu
ang xa » lang xa, mang xa, dang xay
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: su ((sach thu) or (sach uu)) ang xa hoi. hieu van cac ((xuc va) or (thuc vat)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach uu)) ang xa hoi. hieu van cac ((xuc va) OR (thuc vat)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sach uu)) ang xa hoi. hieu van cac ((xuc va) or (thuc vat)) hanh vai cua tre*.