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

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 system."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("Global environmental performance series.") OR ("global environmental governance system."))*.
• Removing quotes may allow a broader search: (( Global environmental performance series. ) or ( global environmental governance system. ))*.