Perhaps you should try some spelling variations:
passiver » passiven, passively, passiert
passivieren » passivierende, passivierung, passieren
passivierenr » passivierender, passivierungr, passierenr, passivierende, passivierung
passioniert » passionierte, passionierter, passionierten

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 passive) OR ((passivieren OR passioniert) OR passivierenr)).
• Adding a wildcard symbol may retrieve word variants: ((passiver or passive) or ((passivieren or passioniert) or passivierenr))*.