Perhaps you should try some spelling variations:
"reform management reports." » "reform management reform.", "farm management reports.", "firm management reports."
"cash management reviews." » "cash management review.", "cash management overview.", "cash management reforms.", "asset management reviews."
"debt management reviews." » "debt management review.", "debt management overview.", "debt management reforms."
"oxford management control." » "oxford management contracts.", "records management control.", "fund management control.", "flood management control."
"waste management water." » "waste management based.", "waste management a.", "waste management areas."
"case management data." » "change management data.", "asset management data.", "chain management data.", "case management a."
"case management case." » "change management case.", "asset management case.", "chain management case.", "case management a."

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