Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenener » passiveenener, massivenener, passivenenener, passivierender, passiverer, passivenner, passiveandner, passivererner
passivenerwerb » passiveenerwerb, massivenerwerb, passivenenerwerb, passiverwerb, passivenrwerb, passiveandrwerb, passivererrwerb
passivene » passiveene, massivene, passivenene, passiven, passiveand, passiverer

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