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

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 (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 (passiveeeren OR passivieren)))))".
• Adding a wildcard symbol may retrieve word variants: (massiv or (passiveren or ((massigeren or massigen) or (passiveeren or (passiveeeren OR passivieren)))))*.