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

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 ((passivieren OR passieren) OR massivereren)) OR massiven).
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passivieren or passieren) or massivereren)) or massiven)*.