Perhaps you should try some spelling variations:
"case management controls." » "case management control.", "case management contract.", "case management tools.", "cash management controls.", "waste management controls.", "change management controls."
"city management centers." » "city management control.", "city management water.", "city management energy.", "cash management centers.", "data management centers.", "crop management centers."
"reform management concepts." » "firm management concepts."
"farm management reform." » "cash management reform.", "bank management reform.", "data management reform."
"demand management a." » "demand management _."
"debt management a." » "debt 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: (("farm management reform.") OR ((((((("city management centers.") OR ("case management controls."))) OR ((("demand management a.") OR ("debt management a."))))) OR ((("land management contracts.") OR ("reform management concepts."))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"farm management reform.\") or (((((((\"city management centers.\") or (\"case management controls.\"))) or (((\"demand management a.\") OR (\"debt management a.\"))))) or (((\"land management contracts.\") or (\"reform management concepts.\"))))))~".
• Removing quotes may allow a broader search: (( farm management reform. ) or ((((((( city management centers. ) or ( case management controls. ))) or ((( demand management a. ) OR ( debt management a. ))))) or ((( land management contracts. ) or ( reform management concepts. ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("farm management reform.") or ((((((("city management centers.") or ("case management controls."))) or ((("demand management a.") OR ("debt management a."))))) or ((("land management contracts.") or ("reform management concepts."))))))*.