Perhaps you should try some spelling variations:
massiv » massive
passiveren » passivieren, passieren, passiverer
massigeren » massiger, massigen, massivere
passiveeren » passivieren, passieren, passiverer
passiveeeren » passivieren, passieren, passiverer

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