Perhaps you should try some spelling variations:
performance metrics » performance measures
performance series » performance studies, performance size
poor performance » sector performance
improving poor » improving power, improving food, improving peer
do performance » di performance, 2 performance, 3 performance
improving do » improving co, improving eco, improving pro

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( improving poor performance series. ) or ( improving do performance metrics. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( improving poor performance series. ) OR ( improving do performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (( improving poor performance series. ) or ( improving do performance metrics. ))*.