Perhaps you should try some spelling variations:
experimentier » experimentiert, experimenting, experimentis
experimentieren » experimentierten, experimentingen, experimentisen
experimentierte » experimentiertte, experimentingte, experimentiste, experimentiert, experimentierfeld, experimentierens

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: ( (experimentier OR experimentieren) OR experimentierte ).
• The words AND, OR and NOT may confuse the search; try adding quotes: "( (experimentier OR experimentieren) or experimentierte )".
• Adding a wildcard symbol may retrieve word variants: ( (experimentier OR experimentieren) or experimentierte )*.