Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, nam duoc
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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) OR (hoc sach)) ky nang x ho. hieu qua ((cam duc) OR (pham duc)) van hanh di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (hoc sach)) ky nang x ho. hieu qua ((cam duc) OR (pham duc)) van hanh di cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (hoc sach)) ky nang x ho. hieu qua ((cam duc) OR (pham duc)) van hanh di cua triet*.