Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveierender » passiveeierender, massiveierender, passiveneierender, passivierender, passivierende, passivierenden
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
aktivierender » aktivierenden, aktivierende, aktivieren

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 passion) OR ((passiveierender OR aktivierender) OR passivieren)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passion) or ((passiveierender or aktivierender) or passivieren))*.