Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
van cac » van hac, van cau, van bac
so sach » bo sach, co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
so sanh » do sanh
y nang » ky nang, v nang, may nang
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: ((so sach) OR (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu van cac tu va hanh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu van cac tu va hanh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ((y nang) OR (ly nang)) x hoi. hieu van cac tu va hanh vai cua viet*.