Perhaps you should try some spelling variations:
passiver » passiven, passively, passiert
passivere » passivene, passivelye, passierte, massivere, passivieren, passiert
passiverer » passivener, passivelyer, passierter, massiverer, passivierenr, passiertr, passiverwerb, passivieren, passieren
passiviert » passioniert, passivieren, passiert

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 passiviert) OR passiverer)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiver or passive) or ((passivere OR passiviert) or passiverer))".
• Adding a wildcard symbol may retrieve word variants: ((passiver or passive) or ((passivere OR passiviert) or passiverer))*.