Perhaps you should try some spelling variations:
massiv » massive
passiveren » passivieren, passieren, passiven
massigeren » massiger, massivere, massierer
massigen » massiger, massige, massigung
passiveeren » passivieren, passieren, passivierende
passiverer » passiverwerb, passivieren, passiver
passiveeeren » passivieren, 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 passiverer) OR passiveeeren))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(massiv or (passiveren or ((massigeren or massigen) or ((passiveeren OR passiverer) or passiveeeren))))*".