Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passivierender » massivierender, passiverierender, passivierende, aktivierender, passivieren
passiverwerb » massiverwerb, passivererwerb, passiverer
passive » massive, passivere

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 passiven) OR (passivierender OR passiverwerb)) OR passive).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiven) or (passivierender or passiverwerb)) or passive)".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiven) or (passivierender or passiverwerb)) or passive)*.