Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivierung » passiveierung, passivenierung, passiverierung, aktivierung
massiv » massive
massiveren » massiveeren, massivere, massivement, passivieren
massigeren » massiger, massivere, massierer
massigen » massiger, massige, massigung

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 (passivierung OR (massiveren OR (massigeren OR massigen)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or (passivierung or (massiveren or (massigeren OR massigen))))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passivierung or (massiveren or (massigeren OR massigen))))*.