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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("reform management readers.") OR ("flood management reform."))) OR ((("demand management control.") OR ("oxford management concepts."))))~.
• Removing quotes may allow a broader search: (((( reform management readers. ) or ( flood management reform. ))) or ((( demand management control. ) or ( oxford management concepts. ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("reform management readers.") or ("flood management reform."))) or ((("demand management control.") or ("oxford management concepts."))))*.