Perhaps you should try some spelling variations:
"improving gender performance series." » "improving under performance series.", "improving better performance series.", "improving teacher performance series.", "improving gender performance metrics.", "improving gender performance reviews.", "improving gender performance review.", "improving energy performance series.", "improving water performance series.", "improving land performance series."
"improving country performance evidence." » "improving voluntary performance evidence.", "importing country performance evidence.", "borrowing country performance evidence."

Try widening your search to All Fields.

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