Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ty ang » ty xang, ty anh
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty ang) or (ty hang)) xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty ang) OR (ty hang)) xa hoi. hieu ve cac ((xuc va) OR (tuc va)) hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty ang) or (ty hang)) xa hoi. hieu ve cac ((xuc va) or (tuc va)) hanh vai cua tre*.