Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierender » passiveierender, massivierender, passivenierender, passivierende, aktivierender, passivieren
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb
passiverer » passiveerer, massiverer, passivenerer, passivieren, passiver, passieren

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 (passivierender OR passiverwerb)) OR passiverer)*.