Perhaps you should try some spelling variations:
"improving trade performance review." » "improving trade performance risk.", "improving trade performance evidence.", "improving care performance review.", "improving tax performance review.", "improving teacher performance review."
"improving poor performance contracts." » "improving sector performance contracts.", "improving power performance contracts.", "improving food performance contracts.", "improving peer performance contracts."

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 review.") or ("improving poor performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving trade performance review.") OR ("improving poor performance contracts.")).
• Removing quotes may allow a broader search: (( improving trade performance review. ) or ( improving poor performance contracts. )).
• Adding a wildcard symbol may retrieve word variants: (("improving trade performance review.") or ("improving poor performance contracts."))*.