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