Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveerer » passiveeerer, passiveneerer, passivereerer, passiverer, passivieren, passiverwerb
massiv » massive
massiveren » massiveeren, massivere, massigeren, passivieren
massivement » massiveement

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 (massiveren OR massivement)) OR passiveerer)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR massiv) or (massiveren or massivement)) or passiveerer)*".