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