Perhaps you should try some spelling variations:
performance contract » performance contracts
overall performance » average performance, thermal performance, governance performance
improving overall » improving coverage, improving rural, improving federal
performance risks » performance risk
zur performance » zur performanz, court performance, poor performance
improving zur » improving burn, improving air, improving care

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

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