Perhaps you should try some spelling variations:
massiv » massive
passiveren » passiverer, passiven, passiver
massigeren » massiger, massivere, massierer
massigen » massiger, massige, massigung
passiveeren » passiverer, passivierende, passivierung
passieren » passiert, passiven
passiveeeren » passiverer
passivieren » passivierende, passivierung, passagieren

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