Perhaps you should try some spelling variations:
"improving city performance contract." » "improving city performance contracts.", "improving firm performance contract.", "improving high performance contract.", "improving key performance contract.", "improving its performance contract.", "improving equity performance contract.", "improving birth performance contract."
"emerging export performance series." » "emerging export performance metrics.", "emerging export performance reviews.", "emerging export performance review.", "leveraging export performance series.", "emerging post performance series.", "improving export 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: (("emerging export performance series.") or ("improving city performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("emerging export performance series.") OR ("improving city performance contract.")).
• Removing quotes may allow a broader search: (( emerging export performance series. ) or ( improving city performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("emerging export performance series.") or ("improving city performance contract."))*.