Perhaps you should try some spelling variations:
"land management concepts." » "land management contracts."
"demand management centers." » "demand management controls.", "demand management control.", "demand management water.", "debt management centers."
"oxford management reform." » "reform management reform.", "records management reform.", "farm management reform."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("oxford management reform.") OR ("fund management reform."))) or ("flood management reports."))) or ((("demand management centers.") or ("land management concepts."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oxford management reform.") OR ("fund management reform."))) OR ("flood management reports."))) OR ((("demand management centers.") OR ("land management concepts."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oxford management reform.\") OR (\"fund management reform.\"))) or (\"flood management reports.\"))) or (((\"demand management centers.\") or (\"land management concepts.\"))))*".
• Removing quotes may allow a broader search: (((((( oxford management reform. ) OR ( fund management reform. ))) or ( flood management reports. ))) or ((( demand management centers. ) or ( land management concepts. ))))*.