Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massiveeren » massiveeeren, massivere, massigeren, massivdecken
massigung » massing, massigen
massige » massiger, massig

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 (passivieren OR (massiveeren OR (massigung OR massige)))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passivieren or (massiveeren or (massigung or massige))))*.