Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passively » passiveely, passivenely, passiverely, massively, passive, passivity
passivene » passiveene, passivenene, passiverene, passiven, passiveand, passiverer
aktivierende » aktivierenden, aktivieren, motivierende
massiv » massive

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 passively) OR aktivierende) OR massiv) OR passivene).
• Adding a wildcard symbol may retrieve word variants: ((((passiv or passively) or aktivierende) or massiv) or passivene)*.