Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
massivere » massiver, massive, massively
aktivierende » aktivieren, motivierende, praktizierende
aktivierenden » aktivierenn, motivierenden, praktizierenden, aktivieren, motivierende

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 massivere) OR (aktivierende OR aktivierenden)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massivere) or (aktivierende or aktivierenden))*.