Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiver » massiver, passivener, passiven, passively, passiert
passivenener » massivenener, passivenenener, passivierender, passiverer
passiverwerb » massiverwerb, passivenerwerb, passivenwerb, passivelywerb, passiertwerb, passiverer
passive » massive, passivene

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