Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierungs » passiveierungs, massivierungs, passivenierungs, passivierung, aktivierungs, passivieren
massiven » massive, passiven, massively
massivierende » 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 massivierende)) OR passivierungs).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or massivierende)) or passivierungs)*.