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 government performance risk." » "local government performance risk.", "local governments performance risk.", "total government performance risk.", "global government performance size.", "global government performance based.", "global government performance _."

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