Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passivere » passivee, passivelye, passierte, massivere, passivieren, passiviert
passiverer » passiveer, passivelyer, passierter, massiverer, passivierenr, passiviertr, passiverwerb, passivieren, passieren
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 (passivere OR passiverer)).
• Adding a wildcard symbol may retrieve word variants: ((passiver or passiven) or (passivere or passiverer))*.