Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivenner » massivenner, passivenenner, passiverenner, passiverer, klassevenner, passiverwerb
passive » massive, passivene, passivere
passivene » massivene, passivenene, passiverene, passiven, passiveand, passiverer
massivenerwerb » passiverwerb

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 (passivenner OR massivenerwerb)) OR (passive OR passivene)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passivenner or massivenerwerb)) or (passive or passivene))*.