Perhaps you should try some spelling variations:
"improving total performance series." » "improving total performance studies.", "improving total performance size.", "improving tool performance series.", "improving social performance series.", "improving model performance series.", "improving global performance series.", "improving mental performance series.", "improving data performance series."
"growing global performance series." » "growing global performance studies.", "growing global performance size.", "growing regional performance series.", "growing general performance series.", "growing fiscal performance series.", "going 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 total performance series.") or ("growing global performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving total performance series.") OR ("growing global performance series.")).
• Removing quotes may allow a broader search: (( improving total performance series. ) or ( growing global performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving total performance series.") or ("growing global performance series."))*.