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 indoor performance series." » "improving outdoor performance series.", "improving poor performance series.", "improving donor performance series.", "improving indoor performance studies.", "improving indoor performance size.", "improving india's performance series.", "improving food performance series.", "improving gender 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 country performance review.") OR ("improving indoor performance series."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving country performance review.\") OR (\"improving indoor performance series.\"))".
• Removing quotes may allow a broader search: (( improving country performance review. ) OR ( improving indoor performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving country performance review.") OR ("improving indoor performance series."))*.