Perhaps you should try some spelling variations:
d functionalanalysis » _ functionalanalysis, d funktionalanalysis, v funktionalanalysis
b funktionalanalysis » v funktionalanalysis, _ functionalanalysis, uber funktionalanalysis
8 funktionalanalysis » v funktionalanalysis, _ functionalanalysis, der funktionalanalysis

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: %((d functionalanalysis) OR (((b funktionalanalysis) OR (8 funktionalanalysis))))%22.
• Adding a wildcard symbol may retrieve word variants: %((d functionalanalysis) or (((b funktionalanalysis) or (8 funktionalanalysis))))%22*.