Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivenener » massivenener, passivenenener, passiverenener, passivierender, passiverer
passiverwerb » massiverwerb, passivenerwerb, passivererwerb, passiverer
passive » massive, passivene, passivere
passivere » massivere, passivenere, passiverere, passiverer, passiver

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