Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenener » passiveenener, massivenener, passivenenener, passivierender, passiverer
passiveeene » passiveeeene, massiveeene, passiveneeene, passivierende
massivenerwerb » passiverwerb

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 massivenerwerb)) OR passiveeene)*.