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

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 ("flood management reviews."))) or ("oxford management reform."))) or ("reform management centers."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("land management readers.") OR ("flood management reviews."))) OR ("oxford management reform."))) OR ("reform management centers.")).
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• Adding a wildcard symbol may retrieve word variants: (((((("land management readers.") or ("flood management reviews."))) or ("oxford management reform."))) or ("reform management centers."))*.