Perhaps you should try some spelling variations:
functionalanalysis%22 » funktionalanalysis%22, functionalanalytic%22, funktionalanalyse%22
functionaalanalyse%22 » funktionalanalysis%22, funktionsanalyse%22
funktionalanalyis%22 » funktionalanalysis%22, funktionalanalyse%22, functionalanalytic%22

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: %_ ((functionalanalysis%22 OR functionaalanalyse%22) OR funktionalanalyis%22).
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_ ((functionalanalysis%22 OR functionaalanalyse%22) or funktionalanalyis%22)".
• Adding a wildcard symbol may retrieve word variants: %_ ((functionalanalysis%22 OR functionaalanalyse%22) or funktionalanalyis%22)*.