Perhaps you should try some spelling variations:
"improving trade performance contract." » "improving trade performance contracts.", "improving road performance contract.", "improving tax performance contract.", "improving teacher performance contract."
"improving urban performance series." » "improving urban performance metrics.", "improving urban performance reviews.", "improving urban performance review.", "improving bank performance series.", "improving loan performance series.", "improving can performance series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving urban performance series.") OR ("improving trade performance contract."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving urban performance series.\") OR (\"improving trade performance contract.\"))".
• Removing quotes may allow a broader search: (( improving urban performance series. ) OR ( improving trade performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance series.") OR ("improving trade performance contract."))*.