Perhaps you should try some spelling variations:
"land management centers." » "land management controls.", "land management control.", "land management water."
"oxford management review." » "records management review.", "fund management review.", "farm management review.", "oxford management reform."
"reform management _." » "farm management _."
"demand management data." » "debt management data.", "demand management a.", "demand management case."
"flood management concepts." » "fund management concepts."
"firm management contracts." » "farm management contracts.", "fire management contracts.", "city management contracts."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oxford management review.\") OR (((((((\"firm management contracts.\") OR (\"land management centers.\"))) OR (((\"reform management _.\") OR (\"demand management data.\"))))) OR (\"flood management concepts.\"))))~".
• Removing quotes may allow a broader search: (( oxford management review. ) OR ((((((( firm management contracts. ) OR ( land management centers. ))) OR ((( reform management _. ) OR ( demand management data. ))))) OR ( flood management concepts. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("oxford management review.") OR ((((((("firm management contracts.") OR ("land management centers."))) OR ((("reform management _.") OR ("demand management data."))))) OR ("flood management concepts."))))*.