Perhaps you should try some spelling variations:
"Chicago school of economics" » "Chicago school of economicas", "Chicago school of economic", "Chicago school of economia"
"Chicago school of economicos" » "Chicago school of economicas", "Chicago school of economias"
"Chicago school of economico" » "Chicago school of economia"
"Chicago school of economica" » "Chicago school of economia"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("Chicago school of economics") OR ((("Chicago school of economicos") OR ("Chicago school of economico"))))) OR ("Chicago school of economica"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Chicago school of economics\") OR (((\"Chicago school of economicos\") OR (\"Chicago school of economico\"))))) OR (\"Chicago school of economica\"))".
• Removing quotes may allow a broader search: (((( Chicago school of economics ) OR ((( Chicago school of economicos ) OR ( Chicago school of economico ))))) OR ( Chicago school of economica )).
• Adding a wildcard symbol may retrieve word variants: (((("Chicago school of economics") OR ((("Chicago school of economicos") OR ("Chicago school of economico"))))) OR ("Chicago school of economica"))*.