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

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