Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiverierung » passiveerierung, passivenerierung, passivererierung, passivierung, passivierungs
massiv » massive
massiveren » massiveeren, massivere, massivement, passivieren
massigeren » massiger, massigen, massivere

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 massiv) OR (passiverierung OR (massiveren OR massigeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passiverierung or (massiveren or massigeren)))*.