Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
ky tang » ky dang, kho tang, ky trong
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa

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 ((ky tang) or (ky nang)) ma hoi. hieu ((ve cam) or (ve cac)) xuc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (ky nang)) ma hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (ky nang)) ma hoi. hieu ((ve cam) or (ve cac)) xuc van hanh vai cua tre*.