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." » "asset management a.", "asset management data.", "asset management how."
"bank management control." » "basin management control.", "risk management control.", "demand management control."
"city management case." » "data management case.", "case management case.", "crop management case.", "city management a."

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: (((((((("bank management control.") OR ("debt management contracts."))) OR ("flood management activity."))) OR ((("city management case.") OR ((("cash management board.") OR ("asset management board."))))))) OR ("reform management tools."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"bank management control.\") or (\"debt management contracts.\"))) or (\"flood management activity.\"))) or (((\"city management case.\") or (((\"cash management board.\") OR (\"asset management board.\"))))))) or (\"reform management tools.\"))~".
• Removing quotes may allow a broader search: (((((((( bank management control. ) or ( debt management contracts. ))) or ( flood management activity. ))) or ((( city management case. ) or ((( cash management board. ) OR ( asset management board. ))))))) or ( reform management tools. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((((("bank management control.") or ("debt management contracts."))) or ("flood management activity."))) or ((("city management case.") or ((("cash management board.") OR ("asset management board."))))))) or ("reform management tools."))*.