Perhaps you should try some spelling variations:
experimentiern » experimentieren, experimentiert, experimentiere, experimentiertn, experimentierenn, experimentingn
experimentier » experimentiert, experimentieren, experimenting
experimentierte » experimentiertte, experimentierente, experimentingte, experimentiert, experimentieren, experimentierfeld

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