Perhaps you should try some spelling variations:
"improving local performance studies." » "improving local performance audits.", "improving local performance audit.", "improving local performance standards.", "improving social performance studies.", "improving total performance studies.", "improving fiscal performance studies."
"improving global performance series." » "improving total performance series.", "improving regional performance series.", "improving general performance series.", "improving global performance size.", "improving fiscal performance series.", "improving growth performance series.", "providing global performance series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving global performance series.") or ("improving local performance studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving global performance series.") OR ("improving local performance studies.")).
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