Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierende » passiveierende, massivierende, passivenierende, passivierender, passivieren, passivierung
passivierungr » passiveierungr, massivierungr, passivenierungr, passivierung, passivierungs, passivierender
massively » massive
aktivierende » aktivierenden, aktivieren, motivierende

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 (massively OR (passivierende OR aktivierende))) OR passivierungr).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (massively or (passivierende OR aktivierende))) or passivierungr)".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massively or (passivierende OR aktivierende))) or passivierungr)*.