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.", "firm management tools."
"cash management board." » "cash management a.", "cash management data.", "cash management how.", "asset management board."
"city management case." » "case management case.", "crop management case.", "security management case.", "city management a."
"data management case." » "data management a.", "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 case.") 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 case.\") 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 case. ) 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 case.") OR ("data management case."))) or ("cash management board."))))) or ("reform management tools."))*.