Perhaps you should try some spelling variations:
"improving esm performance reviews." » "improving esm performance review.", "improving esm performance reports.", "improving esm performance risks.", "improving erm performance reviews.", "improving team performance reviews.", "improving exam performance reviews.", "improving e performance reviews.", "improving eap performance reviews."
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil performance series."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving rural performance series.") or ("improving esm performance reviews."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving esm performance reviews.")).
• Removing quotes may allow a broader search: (( improving rural performance series. ) or ( improving esm performance reviews. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance series.") or ("improving esm performance reviews."))*.