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