Perhaps you should try some spelling variations:
passiv » massiv, passiver
passive » massive, passivere
passiverer » massiverer, passivererer, passiverwerb, passivieren, passiver
passiveren » massiveren, passivereren, passivieren, passieren, passiver
passiven » massiven, passiveren, passion

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