Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivenener » massivenener, passivenenener, passiverenener, passivierender, passiverer
passivenerwerb » massivenerwerb, passivenenerwerb, passiverenerwerb, passiverwerb
passive » massive, passivene, passivere

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