Perhaps you should try some spelling variations:
performance contract » performance contracts
senegal performance » general performance, federal performance, sectoral performance
improving senegal » improving central, improving federal, improving legal
human performance » loan performance, thermal performance, chain performance

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

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