Perhaps you should try some spelling variations:
overall performance » average performance, thermal performance, governance performance
improving overall » improving coverage, improving rural, improving poverty
performance risks » performance risk, performance issues, performance based
road performance » board performance, loan performance, good performance
improving road » improving food, improving urban, improving rural

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

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