Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivene » massivene, passivenene, passiverene, passiven, passiverer, passively
passiveand » massiveand, passiveneand, passivereand, passiven
aktivierender » aktivierenden, aktivierende, aktivieren
massiven » massive, passiven, massively
massiveren » massivere, massigeren, massivement

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 ((passivene OR passiveand) OR aktivierender)) OR (massiven OR massiveren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or passive) or ((passivene OR passiveand) or aktivierender)) or (massiven or massiveren))".
• Adding a wildcard symbol may retrieve word variants: (((passiv or passive) or ((passivene OR passiveand) or aktivierender)) or (massiven or massiveren))*.