Perhaps you should try some spelling variations:
"oxford management concepts." » "oxford management contracts.", "reform management concepts.", "records management concepts.", "fund management concepts."
"fire management reports." » "fire management reform.", "side management reports.", "zone management reports.", "finance management reports."
"city management reviews." » "city management review.", "city management overview.", "city management reforms.", "cash management reviews.", "data management reviews.", "crop management reviews."
"case management reviews." » "case management review.", "case management overview.", "case management reforms.", "cash management reviews.", "waste management reviews.", "change management reviews."
"demand management control." » "demand management contracts.", "land management control.", "debt management control."
"oxford management data." » "reform management data.", "records management data.", "fund management data.", "oxford management a.", "oxford management case."

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• Performing a fuzzy search may retrieve terms with similar spellings: (((((("city management reviews.") OR ("case management reviews."))) or ("fire management reports."))) or ((((("oxford management concepts.") or ("oxford management data."))) or ("demand management control."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("city management reviews.") OR ("case management reviews."))) OR ("fire management reports."))) OR ((((("oxford management concepts.") OR ("oxford management data."))) OR ("demand management control.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"city management reviews.\") OR (\"case management reviews.\"))) or (\"fire management reports.\"))) or (((((\"oxford management concepts.\") or (\"oxford management data.\"))) or (\"demand management control.\"))))".
• Removing quotes may allow a broader search: (((((( city management reviews. ) OR ( case management reviews. ))) or ( fire management reports. ))) or ((((( oxford management concepts. ) or ( oxford management data. ))) or ( demand management control. )))).
• Adding a wildcard symbol may retrieve word variants: (((((("city management reviews.") OR ("case management reviews."))) or ("fire management reports."))) or ((((("oxford management concepts.") or ("oxford management data."))) or ("demand management control."))))*.