Perhaps you should try some spelling variations:
"land management controls." » "land management contracts.", "land management contract.", "land management tools.", "land management contractss."
"land management centers." » "land management concepts.", "land management water.", "land management energy."
"oxford management control." » "oxford management contracts.", "reform management control.", "records management control.", "fund management control."

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 centers.") OR ("land management controls."))) or ("oxford management control."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("land management centers.") OR ("land management controls."))) OR ("oxford management control.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"land management centers.\") OR (\"land management controls.\"))) or (\"oxford management control.\"))".
• Removing quotes may allow a broader search: (((( land management centers. ) OR ( land management controls. ))) or ( oxford management control. )).
• Adding a wildcard symbol may retrieve word variants: (((("land management centers.") OR ("land management controls."))) or ("oxford management control."))*.