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

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 (((8 funktionalanalysis) OR (_ functionalanalysis))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22functional analysis) or (((8 funktionalanalysis) OR (_ functionalanalysis))))%22".
• Adding a wildcard symbol may retrieve word variants: %((22functional analysis) or (((8 funktionalanalysis) OR (_ functionalanalysis))))%22*.