Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiverwerb » massiverwerb, passivenerwerb, passivererwerb, passiverer
passive » massive, passivene, passivere
massivierende » passivierende, passivierender, passivierenden

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 (massivierende OR passiverwerb)) OR passive).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massivierende or passiverwerb)) or passive)*.