Perhaps you should try some spelling variations:
"improving health performance reviews." » "improving health performance review.", "improving health performance reports.", "improving health performance results.", "improving heat performance reviews.", "improving wheat performance reviews.", "improving healthcare performance reviews."
"improving land performance risks." » "improving land performance risk.", "improving plant performance risks.", "improving fund performance risks.", "improving und performance risks."

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

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