Perhaps you should try some spelling variations:
"improving do performance contract." » "improving do performance contracts.", "improving di performance contract.", "improving 2 performance contract.", "improving 3 performance contract.", "improving co performance contract.", "improving eco performance contract.", "improving pro performance contract."
"emerging export performance series." » "emerging export performance studies.", "emerging export performance size.", "leveraging export performance series.", "emerging empire performance series.", "emerging empires performance series."

Try widening your search to All Fields.

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