Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenely » passiveenely, massivenely, passivenenely, passively
passiver » passiveer, massiver, passivener, passive, passiven, passively
passieren » passiert, passiven
massivierung » passivierung, passivierungs, massierung

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 (passieren OR massivierung)) OR (passivenely OR passiver)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passieren or massivierung)) or (passivenely or passiver))*.