Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveieren » passiveeieren, massiveieren, passiveneieren, passivieren, passionierten, passivierende
passieren » passiert, passiven
massiveeren » massivere, passivieren, massigeren

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 ((passiveieren OR passieren) OR (massivement OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiveieren or passieren) or (massivement or massiveeren)))*.