Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb, passiverer, passivewerb, passivenwerb, passivelywerb
passivity » passiveity, massivity, passivenity
passiver » passiveer, massiver, passivener, passive, passiven, passively
massiveand » passiveand, massiven

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 ((passiverwerb OR (passivity OR massiveand)) OR (passiver OR passion))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passiverwerb or (passivity or massiveand)) or (passiver or passion)))*.