Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
passiven » passiveen, massiven, passiveren, passive, passion
massiven » massive, massively, massiv
massiver » massive, passiver, massively

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 massiven) OR ((passivieren OR massiver) OR passiven)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiven) or ((passivieren or massiver) or passiven))*.