Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveierender » passiveeierender, massiveierender, passiveneierender, passivierender, passivierende, passivierenden
passivene » passiveene, massivene, passivenene, passiven, passiveand, passiverer
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 (passiveierender OR massiverwerb)) OR passivene).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiveierender or massiverwerb)) or passivene)*.