Perhaps you should try some spelling variations:
massiv » massive
passiveren » passieren, passiverer, passiven
massigeren » massigen, massivere, massierer, massingeren, massiveen, massieen
massiger » massinger, massive, massie
passiveeren » passieren, passiverer, passivierende
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 massiger) OR (passiveeren OR passivieren)))).
• Adding a wildcard symbol may retrieve word variants: (massiv or (passiveren or ((massigeren or massiger) or (passiveeren or passivieren))))*.