Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massigeren » massigen, massivere, massierer, massingeren, massiveen, massieen
massiger » massinger, massive, massie
massiveeren » massivere, massivdecken, massivteilen

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 ((passivieren OR aktivierung) OR ((massigeren OR massiger) OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passivieren or aktivierung) or ((massigeren or massiger) or massiveeren)))*.