Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passivere » passivee, passivelye, passierte, passiverer, massivere, passiviert
passivieren » passivierende, passivierung, passieren
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 passivieren)) OR passiven) OR passives).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiver or (passivere OR passivieren)) or passiven) or passives)".
• Adding a wildcard symbol may retrieve word variants: (((passiver or (passivere OR passivieren)) or passiven) or passives)*.