Perhaps you should try some spelling variations:
"improving basic performance reviews." » "improving basic performance review.", "improving basic performance reports.", "improving basic performance risks.", "improving based performance reviews.", "improving music performance reviews.", "improving baseline performance reviews.", "improving air performance reviews.", "improve basic performance reviews."
"improving country performance risk." » "improving voluntary performance risk.", "importing country performance risk.", "improving community performance risk.", "improving country performance 2019."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving basic performance reviews.") OR ("improving country performance risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving basic performance reviews.\") OR (\"improving country performance risk.\"))".
• Removing quotes may allow a broader search: (( improving basic performance reviews. ) OR ( improving country performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving basic performance reviews.") OR ("improving country performance risk."))*.