Perhaps you should try some spelling variations:
massiv » massive
passiven » passive, passion
passivierende » passivierender, aktivierende, passivierung, passivierungde, passierende, passagierende
passivieren » passivierung, passieren, passagieren
passivierungr » passivierung, passivierungs, passivierender

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