Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac duc » cac dac, cac nuoc, cac cuoc
cao duc » dao duc, cao suc, giao duc
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va ((((cac duc) OR (cac du))) OR (cao duc)) van hanh va cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va ((((cac duc) or (cac du))) or (cao duc)) van hanh va cua tre*.