Perhaps you should try some spelling variations:
"improving co performance contract." » "improving co performance contracts.", "improving do performance contract.", "improving crop performance contract.", "improving job performance contract.", "improving _ performance contract.", "improving macro performance contract.", "improving food performance contract."
"improving loan performance series." » "improving loan performance metrics.", "improving loan performance reviews.", "improving loan performance review.", "improving poor performance series.", "improving bank performance series.", "improving _ performance series.", "improving local performance series.", "improving land performance series.", "improving road 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 loan performance series.") or ("improving co performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving loan performance series.") OR ("improving co performance contract.")).
• Removing quotes may allow a broader search: (( improving loan performance series. ) or ( improving co performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance series.") or ("improving co performance contract."))*.