Perhaps you should try some spelling variations:
passiv » passiven, passiver
passive » passivene, passivere
passivere » passivenere, passiverere, passiverer, passiver, massivere
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 (passive OR passivere)) OR aktivierende) OR massiv) OR passivere).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv or (passive OR passivere)) or aktivierende) or massiv) or passivere)".
• Adding a wildcard symbol may retrieve word variants: ((((passiv or (passive OR passivere)) or aktivierende) or massiv) or passivere)*.