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."
"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 ("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 (\"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 ( 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 ("risk management data."))) or ("demand management contracts."))))))) or ("reform management concepts."))*.