Perhaps you should try some spelling variations:
"city management concepts." » "city management contracts.", "cash management concepts.", "data management concepts.", "crop management concepts."
"city management controls." » "city management contracts.", "city management contract.", "city management tools.", "city management contractss.", "cash management controls.", "data management controls.", "crop management controls."
"farm management reports." » "farm management reform.", "cash management reports.", "bank management reports.", "data management reports."
"case management readers." » "case management centers.", "case management reviews.", "case management reform.", "cash management readers.", "waste management readers.", "change management readers."
"oxford management control." » "oxford management contracts.", "reform management control.", "records management control.", "fund management control."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("farm management reports.") or ((("case management readers.") or ((("city management concepts.") or ("city management controls."))))))) or ("oxford management control."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("farm management reports.") OR ((("case management readers.") OR ((("city management concepts.") OR ("city management controls."))))))) OR ("oxford management control.")).
• Removing quotes may allow a broader search: (((( farm management reports. ) or ((( case management readers. ) or ((( city management concepts. ) or ( city management controls. ))))))) or ( oxford management control. )).
• Adding a wildcard symbol may retrieve word variants: (((("farm management reports.") or ((("case management readers.") or ((("city management concepts.") or ("city management controls."))))))) or ("oxford management control."))*.