Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierende » passiveierende, massivierende, passivenierende, passivierender, passivieren, aktivierende
massiven » massive, passiven, massively
massivierungr » 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 (massiven OR passivierende)) OR massivierungr).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or passivierende)) or massivierungr)*.