Perhaps you should try some spelling variations:
"land management centers." » "land management controls.", "land management water."
"flood management entity." » "flood management activity.", "flood management quality.", "flood management action.", "fund management entity."
"land management energy." » "land management agency."
"reform management contract." » "firm management contract."
"asset management concepts." » "debt management concepts."
"asset management contracts." » "debt management contracts."
"farm management control." » "cash management control.", "bank management control.", "data management control."

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: (((((("flood management entity.") OR ((("land management energy.") OR ("land management centers."))))) OR ((("farm management control.") OR ((("asset management concepts.") OR ("asset management contracts."))))))) OR ("reform management contract."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"flood management entity.\") or (((\"land management energy.\") or (\"land management centers.\"))))) or (((\"farm management control.\") or (((\"asset management concepts.\") OR (\"asset management contracts.\"))))))) or (\"reform management contract.\"))~".
• Removing quotes may allow a broader search: (((((( flood management entity. ) or ((( land management energy. ) or ( land management centers. ))))) or ((( farm management control. ) or ((( asset management concepts. ) OR ( asset management contracts. ))))))) or ( reform management contract. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("flood management entity.") or ((("land management energy.") or ("land management centers."))))) or ((("farm management control.") or ((("asset management concepts.") OR ("asset management contracts."))))))) or ("reform management contract."))*.