Perhaps you should try some spelling variations:
passiver » passiven, passively
passivere » passivene, passivelye, passiverer, massivere, passivieren
passivelye » passively, massively, passivel
passioniert » passionierte, passionierter, passionierten
passivener » passiverer, passiven, passiverwerb

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