Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivenener » massivenener, passivenenener, passiverenener, passivierender, passiverer
passiverwerb » massiverwerb, passivenerwerb, passivererwerb, passiverer
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 passive) OR (passivenener OR passiverwerb)) OR passivere)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passive) or (passivenener or passiverwerb)) or passivere)*".