Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivierung » passiveierung, passivenierung, passiverierung, aktivierung
massiv » massive
massivieren » massiveieren, passivieren, massivere, passivierende
massiveren » massiveeren, massivere, massivement, passivieren
massiveeren » massiveeeren, massivere, passivieren, massivdecken
massigeren » massiger, massigen, massivere

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