Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivere » passiveere, massivere, passivenere, passiverer, passiver
passiveer » passiveeer, massiveer, passiveneer, passiverer, passiver, passiviert
massiver » massive, massiven, passiver
aktivierende » aktivierenden, aktivieren, motivierende

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