Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenener » passiveenener, massivenener, passivenenener, passivierender, passiverer
passivenerwerb » passiveenerwerb, massivenerwerb, passivenenerwerb, passiverwerb
passivere » passiveere, massivere, passivenere, passiverer, passiver

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