Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac tro
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu 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
cac toc » cac toi, cac nuoc
sach ky » sac ky, sach y, sach ty
cac tu » cac thu, cach tu, cac du
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: su sach ky nang x hoi. hieu van ((cac tu) OR (((cac toc) OR (cac thoi)))) va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu van ((cac tu) or (((cac toc) OR (cac thoi)))) va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu van ((cac tu) or (((cac toc) OR (cac thoi)))) va hanh vai cua tre*.