Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
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 ((van cac) OR (van cau)) duc van hanh va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((van cac) OR (van cau)) duc van hanh va ((cua tre) or (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van cac) OR (van cau)) duc van hanh va ((cua tre) or (cua triet))*.