Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
vai cua » dai cua, hai cua, lai cua
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 » truc va, tuc xa, duc 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 y ang xa hoi. hieu ve cac ((xuc va) or (((tuc va) OR (thuc va)))) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ang xa hoi. hieu ve cac ((xuc va) OR (((tuc va) OR (thuc va)))) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ang xa hoi. hieu ve cac ((xuc va) or (((tuc va) OR (thuc va)))) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ang xa hoi. hieu ve cac ((xuc va) or (((tuc va) OR (thuc va)))) hanh vai cua tre*.