Perhaps you should try some spelling variations:
"flood management activity." » "flood management activities.", "flood management facility.", "flood management authority.", "land management activity.", "fund management activity."
"reform management tools." » "farm management tools."
"basin management control." » "chain management control.", "business management control.", "crisis management control."
"firm management water." » "firm management case.", "firm management data.", "firm management a.", "farm management water.", "fire management water.", "city management water."
"cash management based." » "cash management case.", "cash management board.", "cash management issues.", "asset management based."

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: (((((((((("risk management control.") OR ("risk management contracts."))) OR ("basin management control."))) OR ("flood management activity."))) OR ((("firm management water.") OR ("cash management based."))))) OR ("reform management tools."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((((\"risk management control.\") OR (\"risk management contracts.\"))) or (\"basin management control.\"))) or (\"flood management activity.\"))) or (((\"firm management water.\") or (\"cash management based.\"))))) or (\"reform management tools.\"))~".
• Removing quotes may allow a broader search: (((((((((( risk management control. ) OR ( risk management contracts. ))) or ( basin management control. ))) or ( flood management activity. ))) or ((( firm management water. ) or ( cash management based. ))))) or ( reform management tools. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((((((("risk management control.") OR ("risk management contracts."))) or ("basin management control."))) or ("flood management activity."))) or ((("firm management water.") or ("cash management based."))))) or ("reform management tools."))*.