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.", "flood management _ctivity."
"security management a." » "liquidity management a.", "community management a.", "security management _."
"reform management tools." » "farm management tools.", "firm management tools."
"cash management board." » "cash management data.", "cash management how.", "asset management board."
"city management a." » "case management a.", "crop management a.", "facility management a.", "city management _."
"data management case." » "bank management case.", "demand management case.", "chain 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: (((((((("risk management control.") OR ("debt management contracts."))) OR ("flood management activity."))) OR ((((((("city management a.") OR ("security management a."))) OR ("data management case."))) OR ("cash management board."))))) OR ("reform management tools."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"risk management control.\") or (\"debt management contracts.\"))) or (\"flood management activity.\"))) or (((((((\"city management a.\") OR (\"security management a.\"))) or (\"data management case.\"))) or (\"cash management board.\"))))) or (\"reform management tools.\"))~".
• Removing quotes may allow a broader search: (((((((( risk management control. ) or ( debt management contracts. ))) or ( flood management activity. ))) or ((((((( city management a. ) OR ( security management a. ))) or ( data management case. ))) or ( cash management board. ))))) or ( reform management tools. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((((("risk management control.") or ("debt management contracts."))) or ("flood management activity."))) or ((((((("city management a.") OR ("security management a."))) or ("data management case."))) or ("cash management board."))))) or ("reform management tools."))*.