Perhaps you should try some spelling variations:
_ functionalanalysis » 8 funktionalanalysis, v funktionalanalysis, der funktionalanalysis
b funktionalanalysis » 8 funktionalanalysis, v funktionalanalysis, uber funktionalanalysis
functional » function, functions
functionalanalysis » functionanalysis, functionsanalysis

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: %((functional analysis) OR (((_ functionalanalysis) OR (b funktionalanalysis))))%22.
• Adding a wildcard symbol may retrieve word variants: %((functional analysis) or (((_ functionalanalysis) or (b funktionalanalysis))))%22*.