Perhaps you should try some spelling variations:
"land management activity." » "land management activities.", "land management facility.", "land management authority.", "land management _ctivity."
"risk management control." » "risk management contracts."
"chain management control." » "chain management contracts."
"land management entity." » "land management energy.", "land management quality.", "land management centers."
"reform management tools." » "farm management tools."
"cash management based." » "cash management case.", "cash management board.", "cash management issues.", "asset management based."
"firm management a." » "farm management a.", "fire management a.", "city management a.", "firm 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: (((((((("risk management control.") OR ("chain management control."))) OR ((("land management entity.") OR ("land management activity."))))) OR ((("firm management a.") OR ("cash management based."))))) OR ("reform management tools."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"risk management control.\") or (\"chain management control.\"))) or (((\"land management entity.\") OR (\"land management activity.\"))))) or (((\"firm management a.\") or (\"cash management based.\"))))) or (\"reform management tools.\"))~".
• Removing quotes may allow a broader search: (((((((( risk management control. ) or ( chain management control. ))) or ((( land management entity. ) OR ( land management activity. ))))) or ((( firm management a. ) or ( cash management based. ))))) or ( reform management tools. ))~.
• Adding a wildcard symbol may retrieve word variants: (((((((("risk management control.") or ("chain management control."))) or ((("land management entity.") OR ("land management activity."))))) or ((("firm management a.") or ("cash management based."))))) or ("reform management tools."))*.