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 metrics." » "Global environmental performance contracts.", "Global environmental performance measures.", "Global environmental performance contract."

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