Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
hanh va » hang va
cua tre » cua te, cuu tre, cua triet
ang xa » lang xa, mang xa, dang xay
ve cac » va cac, vien cac
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 y ang xa hoi. hieu ve cac ((xuc va) or (tuc va)) ((hanh vi) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ang xa hoi. hieu ve cac ((xuc va) OR (tuc va)) ((hanh vi) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ang xa hoi. hieu ve cac ((xuc va) or (tuc va)) ((hanh vi) or (hanh va)) cua tre*.