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