Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passivenener » massivenener, passiverenener, passionener, passivierender
passiverwerb » massiverwerb, passivererwerb
passiverer » massiverer, passivererer, passivieren, passiver, passieren
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 (passivenener OR (passiverwerb OR passiverer))) OR passive).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or passiven) or (passivenener or (passiverwerb OR passiverer))) or passive)".
• Adding a wildcard symbol may retrieve word variants: (((passiv or passiven) or (passivenener or (passiverwerb OR passiverer))) or passive)*.