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