Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passagieren
massiven » massive, passiven, massiv
massively » massive
passieren » passiert, passiven
massivieren » massivere, massigeren, passivierende

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