Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passivieren » passiveieren, massivieren, passiverieren, passivierende, passagieren, passivierender
passivierung » passiveierung, massivierung, passiverierung, aktivierung
passiven » passiveen, massiven, passiveren, passive, passion
passieren » passiert
massiveren » massivere, massivement, massiven
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 (((passivieren OR passivierung) OR (passieren OR passiven)) OR (massiveren OR massigeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (((passivieren or passivierung) or (passieren OR passiven)) or (massiveren or massigeren)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (((passivieren or passivierung) or (passieren OR passiven)) or (massiveren or massigeren)))*.