Perhaps you should try some spelling variations:
passiv » massiv, passiven
passive » massive, passivene
passiveneand » massiveneand, passiveneneand, passiveand
passiver » massiver, passivener, passiven, passively, passiert
aktivierende » aktivierenden, motivierende, praktizierende, aktivierungde
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 ((aktivierende OR aktivieren) OR passiveneand)) OR passiver))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((passive or ((aktivierende OR aktivieren) or passiveneand)) or passiver))*".