Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, passiven, massively
passivereren » passivieren, passivierenden, passieren, passiverwerben, passivierenen, passiveren
passiverer » passiverwerb, passivieren, passiver
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: (massiv OR (massiven OR ((passivereren OR passiverer) OR aktivierenden)))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(massiv or (massiven or ((passivereren OR passiverer) or aktivierenden)))*".