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