Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiverer » passiveerer, passivenerer, passivererer, passiverwerb, passivieren, passiver
passiveand » passiveeand, passiveneand, passivereand, passiven
massiv » massive
massivity » massiveity, passivity, emissivity, massively
massiver » massiveer, massive, massiven, passiver
massiveene » massiveeene, massivement, massiven, massivere

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 ((massivity OR massiver) OR passiverer)) OR (massiveene OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR massiv) or ((massivity or massiver) or passiverer)) or (massiveene or passiveand))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR massiv) or ((massivity or massiver) or passiverer)) or (massiveene or passiveand))*.