Perhaps you should try some spelling variations:
"Oxford management controls." » "Oxford management control.", "Oxford management tools.", "Oxford management concepts."
"Oxford management contract." » "Oxford management control."
"oxford management contracts." » "oxford management controls.", "reform management contracts.", "records management contracts.", "fund management contracts."

Try widening your search to All Fields.

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