Perhaps you should try some spelling variations:
passiven » passive, passion
massiven » massive, massively, massiv
passivierender » passivierende, aktivierender, passivieren
passivierungr » passivierung, passivierungs, passivieren

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: ((passiven OR (massiven OR passivierender)) OR passivierungr).
• Adding a wildcard symbol may retrieve word variants: ((passiven or (massiven or passivierender)) or passivierungr)*.