Perhaps you should try some spelling variations:
"university of oxford / hart half" » "university of oxford / hart hall", "university of oxford / short half", "university of oxford / past half"
"university of oxford / last half" » "university of oxford / elastic half"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"university of oxford / hart half\") OR (\"university of oxford / last half\"))".
• Removing quotes may allow a broader search: (( university of oxford / hart half ) OR ( university of oxford / last half )).
• Adding a wildcard symbol may retrieve word variants: (("university of oxford / hart half") OR ("university of oxford / last half"))*.