Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierung » passiveierung, massivierung, passivenierung, aktivierung
massiven » massive, passiven, massively
massiveierende » passivierende, passivierender, passivierenden

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 massiveierende)) OR passivierung).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or massiveierende)) or passivierung)*.