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 issues." » "Global environmental performance measures.", "Global environmental performance based.", "Global environmental performance size."

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