Perhaps you should try some spelling variations:
passiv » passiven
passiver » passivener, passiven, passively, passiert
passive » passivene
passivere » passivenere, passivene, passivelye, passierte, passiverer, massivere, passivieren
aktivierende » aktivierenden, aktivieren, motivierende
massiv » massive

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