Perhaps you should try some spelling variations:
"crop management activity." » "crop management activities.", "crop management facility.", "crop management authority.", "case management activity.", "crisis management activity.", "chain management activity.", "crop management _ctivity."
"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 data.", "cash management based.", "asset management water."
"care management control." » "case management control.", "fire management control.", "change management control."
"risk management a." » "risk management _."

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 ((("care management control.") OR ((((("cash management water.") OR ("risk management a."))) OR ("demand management contracts."))))))) OR ("reform management concepts."))~.
• Removing quotes may allow a broader search: (((( crop management activity. ) or ((( care management control. ) or ((((( cash management water. ) or ( risk management a. ))) or ( demand management contracts. ))))))) or ( reform management concepts. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("crop management activity.") or ((("care management control.") or ((((("cash management water.") or ("risk management a."))) or ("demand management contracts."))))))) or ("reform management concepts."))*.