Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivierung » passiveierung, passivenierung, passiverierung, aktivierung
passiverierung » passiveerierung, passivenerierung, passivererierung, passivierungs
massiv » massive
massiveren » massiveeren, massivere, massivement, passivieren
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 ((passivierung OR passiverierung) OR (massiveren OR massigeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or ((passivierung OR passiverierung) or (massiveren or massigeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or ((passivierung OR passiverierung) or (massiveren or massigeren)))*.