Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierung » passiveierung, massivierung, passivenierung, aktivierung
passieren » passiert, passiven
massiveren » massivere, massigeren, massivement
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 ((passieren OR passivierung) OR (massiveren OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passieren or passivierung) or (massiveren or massiveeren)))*.