Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
van hac » van hoc, van ha, van hai
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
luc va » loc 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 xang xa hoi. hieu van hac ((duc va) or (((luc va) OR (tuc va)))) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. hieu van hac ((duc va) OR (((luc va) OR (tuc va)))) hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. hieu van hac ((duc va) or (((luc va) OR (tuc va)))) hanh vai cua tre*".