Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivener » passiveener, massivener, passivenener, passiverer, passiven, passiverwerb
passiver » passiveer, massiver, passivener, passive, passiven, passively
massivene » massiven, massivere, massive
passieren » passiert, passiven

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