Perhaps you should try some spelling variations:
"oxford management concepts." » "oxford management contracts.", "records management concepts.", "fund management concepts.", "flood management concepts."
"land management readers." » "land management centers.", "land management reform.", "land management reports."
"farm management readers." » "farm management centers.", "farm management reform.", "farm management reports.", "cash management readers.", "bank management readers.", "data management readers."
"farm management reviews." » "farm management review.", "farm management overview.", "farm management reports.", "cash management reviews.", "bank management reviews.", "data management reviews."
"reform management control." » "reform management contracts.", "firm management control."

Try widening your search to All Fields.

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