Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveen » passiveeen, passiveneen, passivereen, passiven, passivieren, passiveand
massiv » massive
aktivierender » aktivierenden, aktivierende, aktivieren

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 massiv) OR passiveen) OR aktivierender).
• Adding a wildcard symbol may retrieve word variants: (((passiv or massiv) or passiveen) or aktivierender)*.