Perhaps you should try some spelling variations:
passiver » passiven, passively, passiert
passiverer » passivener, passivelyer, passierter, passiverwerb, passivieren, passieren
passivenener » passivierender, passivenner, passiveandner, passivelyner
passivene » passiven, passiveand, passively

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 (passivenener OR passiverer)) OR (passive OR passivene))*.