Perhaps you should try some spelling variations:
passiv » massiv, passiver
passively » massively, passiverely, passivity
passiven » massiven, passiveren, passion
passive » massive, passivere
passivierenden » massivierenden, passiverierenden, passivierende, passivierender, aktivierenden

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 passively) OR (passiven OR passive)) OR passivierenden).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passively) or (passiven or passive)) or passivierenden)*.