Perhaps you should try some spelling variations:
"improving land performance reviews." » "improving land performance review.", "improving land performance reports.", "improving land performance risks.", "improving plant performance reviews.", "improving fund performance reviews.", "improving und performance reviews."
"improving firms performance risk." » "improving firm performance risk.", "improving firm performances risk.", "improving funds performance risk.", "improving firms performance 2019.", "improving farmers performance risk.", "importing firms performance risk.", "improving air performance risk."

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

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