Perhaps you should try some spelling variations:
performance metrics » performance contracts, performance measures, performance contract
performance series » performance reviews, performance review, performance targets
improving export » improving labor, emerging export, improving upper
port performance » court performance, plant performance, firm performance
improving port » improving poverty, improving birth, improving power

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 port performance metrics. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( improving export performance series. ) OR ( improving port performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (( improving export performance series. ) or ( improving port performance metrics. ))*.