Perhaps you should try some spelling variations:
"flood management concepts." » "flood management contracts."
"farm management controls." » "farm management control.", "farm management contracts.", "farm management contract.", "cash management controls.", "bank management controls.", "data management controls."
"oxford management review." » "reform management review.", "records management review.", "road management review."
"land management water." » "land management case.", "land management based.", "land management areas."
"city management a." » "cash management a.", "data management a.", "case management a.", "city management _."
"demand management data." » "demand management case."
"debt management data." » "debt management case."

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: (((("oxford management review.") OR ("fund management reform."))) OR ((((((("farm management controls.") OR ("land management water."))) OR ((("city management a.") OR ((("demand management data.") OR ("debt management data."))))))) OR ("flood management concepts."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oxford management review.\") or (\"fund management reform.\"))) or (((((((\"farm management controls.\") or (\"land management water.\"))) or (((\"city management a.\") or (((\"demand management data.\") OR (\"debt management data.\"))))))) or (\"flood management concepts.\"))))~".
• Removing quotes may allow a broader search: (((( oxford management review. ) or ( fund management reform. ))) or ((((((( farm management controls. ) or ( land management water. ))) or ((( city management a. ) or ((( demand management data. ) OR ( debt management data. ))))))) or ( flood management concepts. ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("oxford management review.") or ("fund management reform."))) or ((((((("farm management controls.") or ("land management water."))) or ((("city management a.") or ((("demand management data.") OR ("debt management data."))))))) or ("flood management concepts."))))*.