Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
su sach » so sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vu sach » vu bach, vu khach
ve cac » va cac
x hoi » xa hoi, o hoi, x ho
lo va » lo van, lao va, ly va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ky nang x hoi. hieu ((ve cac) OR (vien cac)) lo va hanh vai cua tre*.