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."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"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. )).
• Adding a wildcard symbol may retrieve word variants: (("global environmental performance series.") OR ("global environmental governance issues."))*.