Perhaps you should try some spelling variations:
22functional analysis » functional analysis, _ functionalanalysis, d functionalanalysis
d funktionalanalysis » 8 funktionalanalysis, b funktionalanalysis, v funktionalanalysis
functional analyses » functional analysis, function analysis, functional analytic

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