Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, passiven
massively » massiveely, massive
massiveen » massiveeen, massivement, massivsten, massigeren
passivereer » passiverer, passiverwerb, passivierender

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