Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivenener » massivenener, passivenenener, passiverenener, passiverer
passivierender » massivierender, passivenierender, passiverierender, passivierende, aktivierender, passivieren
passive » massive, passivene, passivere
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 ((passivenener OR passivierender) OR massivenerwerb)) OR passive).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or ((passivenener OR passivierender) or massivenerwerb)) or passive)".
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((passivenener OR passivierender) or massivenerwerb)) or passive)*.