Perhaps you should try some spelling variations:
"crop management activity." » "crop management activities.", "crop management facility.", "crop management authority.", "case management activity.", "chain management activity.", "flood management activity."
"crisis management activity." » "crisis management activities.", "crisis management facility.", "crisis management authority.", "chain management activity."
"demand management contracts." » "land management contracts.", "debt management contracts."
"reform management concepts." » "farm management concepts.", "firm management concepts."
"cash management water." » "cash management case.", "cash management based.", "cash management a."
"asset management water." » "asset management case.", "asset management based.", "asset management a.", "debt management water."
"care management control." » "case management control.", "fire management control.", "change management control."
"risk management data." » "risk management a.", "risk 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: (((((("crop management activity.") OR ("crisis management activity."))) OR ((("care management control.") OR ((((((("cash management water.") OR ("asset management water."))) OR ("risk management data."))) OR ("demand management contracts."))))))) OR ("reform management concepts."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"crop management activity.\") or (\"crisis management activity.\"))) or (((\"care management control.\") or (((((((\"cash management water.\") OR (\"asset management water.\"))) or (\"risk management data.\"))) or (\"demand management contracts.\"))))))) or (\"reform management concepts.\"))~".
• Removing quotes may allow a broader search: (((((( crop management activity. ) or ( crisis management activity. ))) or ((( care management control. ) or ((((((( cash management water. ) OR ( asset management water. ))) or ( risk management data. ))) or ( demand management contracts. ))))))) or ( reform management concepts. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("crop management activity.") or ("crisis management activity."))) or ((("care management control.") or ((((((("cash management water.") OR ("asset management water."))) or ("risk management data."))) or ("demand management contracts."))))))) or ("reform management concepts."))*.