Perhaps you should try some spelling variations:
massiv » massive
massivere » massiveere, massiver, massive, massively
passiveren » passieren, passiverer, passiven, passiveen, passivenen, passivelyen
massigen » massiger, massige, massigung
passivieren » passivierende, passivierung, passieren
passiver » passive, passiven, passively

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 ((massivere OR massigen) OR (passivieren OR passiver)))).
• Adding a wildcard symbol may retrieve word variants: (massiv or (passiveren or ((massivere or massigen) or (passivieren or passiver))))*.