Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenener » passiveenener, massivenener, passivenenener, passivierender, passiverer
passiveere » passiveeere, massiveere, passiveneere, passivieren, passiver, massivere
massiverwerb » passiverwerb, massivere, massierer

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 massiverwerb)) OR passiveere)*.