Perhaps you should try some spelling variations:
"land management centers." » "land management concepts.", "land management controls.", "land management energy."
"oxford management control." » "reform management control.", "records management control.", "farm management control."
"demand management contracts." » "debt management contracts."
"flood management water." » "flood management case.", "flood management based.", "flood management a."
"cash management reform." » "asset management reform."
"flood management data." » "flood management a.", "flood 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: (("cash management reform.") OR ((((((("land management centers.") OR ((("flood management water.") OR ("flood management data."))))) OR ("oxford management control."))) OR ((("fund management contracts.") OR ("demand management contracts."))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cash management reform.\") or (((((((\"land management centers.\") or (((\"flood management water.\") OR (\"flood management data.\"))))) or (\"oxford management control.\"))) or (((\"fund management contracts.\") or (\"demand management contracts.\"))))))~".
• Removing quotes may allow a broader search: (( cash management reform. ) or ((((((( land management centers. ) or ((( flood management water. ) OR ( flood management data. ))))) or ( oxford management control. ))) or ((( fund management contracts. ) or ( demand management contracts. ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("cash management reform.") or ((((((("land management centers.") or ((("flood management water.") OR ("flood management data."))))) or ("oxford management control."))) or ((("fund management contracts.") or ("demand management contracts."))))))*.