Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passivenene » passivierende, passiveene, passionene
passivieren » passivierende, passivierung, passieren
passiven » passive, passion
passiveer » passiverer, passiviert, passive

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 ((passivenene OR (passivieren OR passiven)) OR passiveer))*.