Perhaps you should try some spelling variations:
"improving job performance contract." » "improving job performance contracts.", "improving court performance contract.", "improving co performance contract.", "improving food performance contract.", "improving crop performance contract."
"improving trade performance reviews." » "improving trade performance review.", "improving trade performance reports.", "improving trade performance risks.", "improving care performance reviews.", "improving tax performance reviews.", "improving teacher 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 trade performance reviews.") or ("improving job performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving trade performance reviews.") OR ("improving job performance contract.")).
• Removing quotes may allow a broader search: (( improving trade performance reviews. ) or ( improving job performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving trade performance reviews.") or ("improving job performance contract."))*.