Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
passiveen » passiveeen, massiveen, passiveneen, passiven, passiveand, passiverer
aktivierende » aktivierenden, aktivieren, motivierende
massiver » massive, massiven, passiver

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 ((passivieren OR (aktivierende OR passiveen)) OR massiver))*.