Perhaps you should try some spelling variations:
passiv » passive, massiv
passiver » passiveer, massiver, passive, passively, passiert
passivity » passiveity, massivity
passiven » passiveen, massiven, passive, passion
passiveand » passiveeand, massiveand
massiven » massive, massively, massiv
massiveene » massivement, massivere, massereene

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 passiver) OR ((passivity OR passiven) OR massiven)) OR (massiveene OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiver) or ((passivity or passiven) or massiven)) or (massiveene or passiveand))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiver) or ((passivity or passiven) or massiven)) or (massiveene or passiveand))*.