Perhaps you should try some spelling variations:
"improving co performance contract." » "improving co performance contracts.", "improving ceo performance contract.", "improving do performance contract.", "improving core performance contract.", "improving eco performance contract.", "improving crop performance contract.", "improving ict performance contract."
"improving gender performance reviews." » "improving gender performance review.", "improving gender performance reports.", "improving gender performance risks.", "improving gendered performance reviews.", "improving center performance reviews.", "improving under performance reviews.", "improving energy performance reviews."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving gender performance reviews.") or ("improving co performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving gender performance reviews.") OR ("improving co performance contract.")).
• Removing quotes may allow a broader search: (( improving gender performance reviews. ) or ( improving co performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving gender performance reviews.") or ("improving co performance contract."))*.