Perhaps you should try some spelling variations:
22functional analysis » functional analysis, d functionalanalysis, functionl analysis
_ functionalanalysis » 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 (_ functionalanalysis))) OR (functional analyses))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22functional analysis) OR (_ functionalanalysis))) or (functional analyses))%22".
• Adding a wildcard symbol may retrieve word variants: %((((22functional analysis) OR (_ functionalanalysis))) or (functional analyses))%22*.