Perhaps you should try some spelling variations:
"land management overview." » "land management review.", "land management oversight.", "land management services."
"data management concepts." » "data management contracts.", "debt management concepts.", "cash management concepts.", "bank management concepts."
"demand management reviews." » "demand management review.", "demand management reports.", "demand management reforms.", "debt management reviews."
"oxford management reform." » "records management reform.", "fund management reform.", "flood management reform."
"reform management reform." » "farm management reform.", "firm 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 ("reform management reform."))))) OR ("data management concepts."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"land management overview.\") or (\"demand management reviews.\"))) or (((\"oxford management reform.\") OR (\"reform management reform.\"))))) or (\"data management concepts.\"))~".
• Removing quotes may allow a broader search: (((((( land management overview. ) or ( demand management reviews. ))) or ((( oxford management reform. ) OR ( reform management reform. ))))) or ( data management concepts. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("land management overview.") or ("demand management reviews."))) or ((("oxford management reform.") OR ("reform management reform."))))) or ("data management concepts."))*.