Perhaps you should try some spelling variations:
"improving _ performance reviews." » "improving _ performance review.", "improving _ performance reports.", "improving _ performance risks."
"improving poverty performance measures." » "improving energy performance measures.", "improving safety performance measures.", "improving overall performance measures.", "improving property performance measures.", "improving power performance measures.", "improving coverage performance measures."

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

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