Perhaps you should try some spelling variations:
"land management concepts." » "land management contracts."
"land management controls." » "land management control.", "land management contracts.", "land management contract."
"land management energy." » "land management centers."
"land management agency." » "land management agencies.", "land management science.", "land management areas."
"land management entity." » "land management activity.", "land management quality.", "land management centers."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((((("land management energy.") OR ("land management agency."))) or ("land management entity."))) or ("land management concepts."))) or ("land management controls."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((((("land management energy.") OR ("land management agency."))) OR ("land management entity."))) OR ("land management concepts."))) OR ("land management controls.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"land management energy.\") OR (\"land management agency.\"))) or (\"land management entity.\"))) or (\"land management concepts.\"))) or (\"land management controls.\"))".
• Removing quotes may allow a broader search: (((((((( land management energy. ) OR ( land management agency. ))) or ( land management entity. ))) or ( land management concepts. ))) or ( land management controls. )).
• Adding a wildcard symbol may retrieve word variants: (((((((("land management energy.") OR ("land management agency."))) or ("land management entity."))) or ("land management concepts."))) or ("land management controls."))*.