Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
van bac » van ban, van bao, van hac
van cac » van hac, van cau, dan cac
vu sach » vu bach, vu khach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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: ((vu sach) OR (su sach)) ky tang ma hoi. hieu ((van cac) OR (van bac)) nuoc va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ky tang ma hoi. hieu ((van cac) OR (van bac)) nuoc va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky tang ma hoi. hieu ((van cac) OR (van bac)) nuoc va hanh vai cua tre*.