Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierung » passiveierung, massivierung, passivenierung, aktivierung
passivieren » passiveieren, massivieren, passivenieren, passivierende, passagieren, passivierender
massivieren » massivere, massigeren, passivierende
massiveren » massivere, massigeren, massivement
passieren » passiert, 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 ((massivieren OR passivierung) OR (massiveren OR (passivieren OR passieren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((massivieren or passivierung) or (massiveren or (passivieren OR passieren))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massivieren or passivierung) or (massiveren or (passivieren OR passieren))))*.