Perhaps you should try some spelling variations:
"improving crop performance contract." » "improving crop performance contracts.", "improving group performance contract.", "improving top performance contract.", "improving do performance contract.", "improving co performance contract.", "improving pro performance contract.", "improving macro performance contract."
"improving local performance series." » "improving local performance studies.", "improving local performance size.", "improving social performance series.", "improving global performance series.", "improving total performance series.", "improving fiscal 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: (("improving local performance series.") or ("improving crop performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving local performance series.") OR ("improving crop performance contract.")).
• Removing quotes may allow a broader search: (( improving local performance series. ) or ( improving crop performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving local performance series.") or ("improving crop performance contract."))*.