Perhaps you should try some spelling variations:
"improving firm performance metrics." » "improving firm performance contracts.", "improving firm performance measures.", "improving firm performance contract.", "improving _ performance metrics.", "improving firms performance metrics.", "improving air performance metrics.", "improving birth performance metrics."
"improving land performance risk." » "improving plant performance risk.", "improving bank performance risk.", "improving loan performance risk.", "improving land performance size.", "improving land performance based.", "improving land performance _.", "improved land 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 firm performance metrics.") OR ("improving land performance risk."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving firm performance metrics.\") OR (\"improving land performance risk.\"))".
• Removing quotes may allow a broader search: (( improving firm performance metrics. ) OR ( improving land performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving firm performance metrics.") OR ("improving land performance risk."))*.