Perhaps you should try some spelling variations:
"farm management concepts." » "farm management contracts.", "cash management concepts.", "bank management concepts.", "data management concepts."
"land management overview." » "land management review.", "land management oversight.", "land management services."
"demand management reviews." » "demand management review.", "demand management reports.", "demand management reforms.", "debt management reviews."
"oxford management reform." » "reform management reform.", "records 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: (((((("land management overview.") OR ("demand management reviews."))) OR ("oxford management reform."))) OR ("farm management concepts."))~.
• Removing quotes may allow a broader search: (((((( land management overview. ) or ( demand management reviews. ))) or ( oxford management reform. ))) or ( farm management concepts. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("land management overview.") or ("demand management reviews."))) or ("oxford management reform."))) or ("farm management concepts."))*.