Perhaps you should try some spelling variations:
passiv » passiver
passive » passivere
passivieren » passiverieren, passivierende, passieren, passagieren
passivierung » passiverierung, aktivierung
passiven » passiveren, passion
massiv » massive

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