Perhaps you should try some spelling variations:
functionalanalysis%22 » functionalanalytic%22, functionaalanalyse%22, funktionalanalyse%22
funktionalanalyis%22 » funktionalanalyse%22, functionalanalytic%22, funktionalanalytische%22
funktionsanalysis%22 » funktionsanalyse%22, funktionsanalytische%22, funktionalanalyse%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 ((funktionalanalyis%22 OR funktionsanalysis%22) OR funktionalanalysis%22)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "%_ (functionalanalysis%22 or ((funktionalanalyis%22 OR funktionsanalysis%22) or funktionalanalysis%22))".
• Adding a wildcard symbol may retrieve word variants: %_ (functionalanalysis%22 or ((funktionalanalyis%22 OR funktionsanalysis%22) or funktionalanalysis%22))*.