Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passiveierende » passivierender, passivierenden, passivieren
passivierende » passivierender, passivieren, aktivierende
massiv » massive
massivere » massiveere, massiver, massive, massively

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