Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivity » passiveity, massivity, passivenity
passiver » passiveer, massiver, passivener, passive, passiven, passively
passiveand » passiveeand, massiveand, passiveneand, passiven
massiver » massive, massiven, massively

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 ((passivity OR massiver) OR passiver)) OR (massivement OR passiveand)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passivity or massiver) or passiver)) or (massivement or passiveand))*.