Perhaps you should try some spelling variations:
"improving country performance review." » "improving country performance risk.", "improving country performance evidence.", "improving voluntary performance review.", "importing country performance review.", "improving community performance review."
"improving export performance series." » "improving export performance studies.", "improving export performance size.", "improving exposure performance series.", "improving eap performance series.", "improving eco performance series."

Try widening your search to All Fields.

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

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