Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
dang xa » dang xay, lang xa, dang ha
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 dang xa hoi. ((hieu van) or (lieu va)) cam ((xuc va) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty dang xa hoi. ((hieu van) OR (lieu va)) cam ((xuc va) OR (tuc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty dang xa hoi. ((hieu van) or (lieu va)) cam ((xuc va) or (tuc va)) hanh vai cua tre*.