Perhaps you should try some spelling variations:
"improving crop performance contract." » "improving crop performance contracts.", "improving poor performance contract.", "improving job performance contract.", "improving city performance contract.", "improving co performance contract.", "improving macro performance contract.", "improving food performance contract."
"improving export performance series." » "improving export performance metrics.", "improving export performance reviews.", "improving export performance review.", "improving labor performance series.", "emerging export performance series.", "improving upper 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 export performance series.") OR ("improving crop performance contract."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving export performance series.\") OR (\"improving crop performance contract.\"))".
• Removing quotes may allow a broader search: (( improving export performance series. ) OR ( improving crop performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving export performance series.") OR ("improving crop performance contract."))*.