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."
"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."

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 do performance contract."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving local performance series.\") OR (\"improving do performance contract.\"))".
• Removing quotes may allow a broader search: (( improving local performance series. ) OR ( improving do performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving local performance series.") OR ("improving do performance contract."))*.