Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivere » passiveere, massivere, passivenere, passiverer, passiver
aktivierende » aktivierenden, aktivieren, praktizierende
motivierende » motivieren, motivierte, motivierten

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: ((passiv OR passivere) OR (aktivierende OR motivierende)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passivere) or (aktivierende or motivierende))*.