Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passivere » passivee, passivelye, passierte, passiverer, massivere, passivieren
massiven » massive, massively, massiv
passiven » passive, passion

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