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

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