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