Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passively » massively, passivenely, passiverely, passivity, passiven
passiveen » massiveen, passiveneen, passivereen, passiven, passivieren, passiveand
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 passive) OR (passively OR (passiveen OR aktivierende))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passive) or (passively or (passiveen or aktivierende)))*.