Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiver » massiver, passivener, passiven, passively
passive » massive, passivene
passiverer » massiverer, passivenerer, passivener, passivelyer, passiverwerb, passivieren, passieren
passiveren » massiveren, passiveneren, passivenen, passivelyen, passivieren, passieren, passiven

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