Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver
passive » massive, passivene, passivere
passivene » massivene, passivenene, passiverene, passiven, passiveand, passively
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 (passiverer OR massivenerwerb)) OR (passive OR passivene)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passiverer or massivenerwerb)) or (passive OR passivene))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiverer or massivenerwerb)) or (passive OR passivene))*.