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