Perhaps you should try some spelling variations:
"improving maternal performance risk." » "improving materials performance risk.", "improving external performance risk.", "improving national performance risk.", "improve maternal performance risk.", "improving water performance risk.", "improving maternal performance 2019."
"improving company performance reviews." » "improving country performance reviews.", "improving company performance review.", "improving company performance reports.", "improving company performance risks.", "improve company performance reviews.", "improving compliance performance reviews.", "improving community performance reviews."

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

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