Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivierende » massivierende, passivenierende, passiverierende, passivierender, passivieren, aktivierende
massivere » massiver, massive, massively
aktivierenden » motivierende, aktivierungden, motivierenden
aktivieren » aktivierung, motivieren

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