Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveer » passiveeer, massiveer, passiveneer, passiverer, passiver, passiviert
passiveneer » passiveeneer, massiveneer, passiveneneer, passiverer, passiverwerb
passiveand » passiveeand, massiveand, passiveneand, passiven
massivity » passivity, emissivity, massively
massiver » massive, massiven, passiver
massiveene » 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 ((massivity OR massiver) OR (passiveer OR passiveneer))) OR (massiveene OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or ((massivity or massiver) or (passiveer OR passiveneer))) or (massiveene or passiveand))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or ((massivity or massiver) or (passiveer OR passiveneer))) or (massiveene or passiveand))*.