Perhaps you should try some spelling variations:
"improving company performance series." » "improving company performance studies.", "improving company performance size.", "improve company performance series.", "improving compliance performance series.", "improving community performance series."
"borrowing country performance review." » "borrowing country performance risk.", "borrowing country performance evidence.", "borrowing countries performance review.", "borrowing costs performance review.", "borrowing cost performance review."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving company performance series.") or ("borrowing country performance review."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving company performance series.") OR ("borrowing country performance review.")).
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• Adding a wildcard symbol may retrieve word variants: (("improving company performance series.") or ("borrowing country performance review."))*.