Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
ve bac » ve bao, ve cac, ve ban
va ban » van ban, va bai, va bao
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho
bo va » bao va, do va, so 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: tu sach ky nang x hoi. hieu ((ve bac) OR (va ban)) bo va hanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((ve bac) or (va ban)) bo va hanh di cua tre*.