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

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 passivieren))) OR passivierungr).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiven or (massiven or (passivierender OR passivieren))) or passivierungr)".
• Adding a wildcard symbol may retrieve word variants: ((passiven or (massiven or (passivierender OR passivieren))) or passivierungr)*.