Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passivere » passivee, passivelye, passierte, passiverer, massivere, passivieren
passiven » passive, passion
passives » passive, passively, passions

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