Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passiveren » passiveen, passivelyen, passierten, passivieren, passieren, passiverer, passiverern, massiveren, passivierenn
passivere » passivee, passivelye, passierte, passiverer, massivere, passivieren
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 (passiven OR passiveren)) OR passivere).
• Adding a wildcard symbol may retrieve word variants: ((passiver or (passiven or passiveren)) or passivere)*.