Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massivieren » massigeren, passivierende, passivierung
massivierung » passivierung, passivierungs, massierung
massiveren » massigeren, massivement, massiven, massivern, massivelyn
massivere » massiver, massive, massively

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: (passiv OR ((massivieren OR massivierung) OR ((massiveren OR massivere) OR passivieren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((massivieren or massivierung) or ((massiveren OR massivere) or passivieren)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massivieren or massivierung) or ((massiveren OR massivere) or passivieren)))*.