Perhaps you should try some spelling variations:
"several complex variables and analysis species" » "several complex variables and analysis special", "several complex variables and analysis series", "several complex variables and analysis specific"
"several complex variables and analysis spaces" » "several complex variables and analysis space", "several complex variables and analytic spaces", "several complex variables and analysis faces"
"several complex variables and analysis speech" » "several complex variables and analysis special"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("several complex variables and analysis spaces") OR ("several complex variables and analysis species"))) OR ("several complex variables and analysis speech")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"several complex variables and analysis spaces\") OR (\"several complex variables and analysis species\"))) or (\"several complex variables and analysis speech\"))".
• Removing quotes may allow a broader search: (((( several complex variables and analysis spaces ) OR ( several complex variables and analysis species ))) or ( several complex variables and analysis speech )).
• Adding a wildcard symbol may retrieve word variants: (((("several complex variables and analysis spaces") OR ("several complex variables and analysis species"))) or ("several complex variables and analysis speech"))*.