Perhaps you should try some spelling variations:
"natural environmental governance series." » "natural environmental performance series.", "natural environment governance series.", "national environmental governance series.", "global environmental governance series."
"global environment governance system." » "global evironmental governance system.", "global environment government system.", "global enforcement governance system."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("global environment governance system.") or ("natural environmental governance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("global environment governance system.") OR ("natural environmental governance series.")).
• Removing quotes may allow a broader search: (( global environment governance system. ) or ( natural environmental governance series. )).
• Adding a wildcard symbol may retrieve word variants: (("global environment governance system.") or ("natural environmental governance series."))*.