Perhaps you should try some spelling variations:
"global environmental performance series." » "global environment performance series.", "legal environment performance series.", "global environmental performance metrics.", "global environmental performance reviews.", "global environmental performance review."
"global environmental governance issues." » "global environment governance issues.", "legal environment governance issues."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("global environmental performance series.") or ("global environmental governance issues."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("global environmental performance series.") OR ("global environmental governance issues."))*.
• Removing quotes may allow a broader search: (( global environmental performance series. ) or ( global environmental governance issues. ))*.