Perhaps you should try some spelling variations:
22functional analysis » functional analysis, functional analyses, d functionalanalysis
_ functionalanalysis » 8 funktionalanalysis, functional analysis, die funktionalanalysis
v funktionalanalysis » 8 funktionalanalysis, die funktionalanalysis, und funktionalanalysis
b funktionalanalysis » 8 funktionalanalysis, uber funktionalanalysis, die 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: %((22functional analysis) OR (((((_ functionalanalysis) OR (((v funktionalanalysis) OR (der funktionalanalysis))))) OR (b funktionalanalysis))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22functional analysis) or (((((_ functionalanalysis) or (((v funktionalanalysis) OR (der funktionalanalysis))))) or (b funktionalanalysis))))%22".
• Adding a wildcard symbol may retrieve word variants: %((22functional analysis) or (((((_ functionalanalysis) or (((v funktionalanalysis) OR (der funktionalanalysis))))) or (b funktionalanalysis))))%22*.