Perhaps you should try some spelling variations:
"nature e society sector." » "nature e social sector.", "nature e society actors.", "nature free society sector.", "nature de society sector.", "nature en society sector.", "nature re society sector."
"natural open society ser." » "nature open society ser.", "national open society ser.", "natural order society ser.", "natural open societe ser.", "natural open society self.", "natural open society sri."
"nature et society ser." » "nature et societe ser.", "nature et society self.", "nature et society sri.", "nature et societes ser.", "nature ceo society ser.", "nature _ society ser.", "nature det society ser.", "nature ent society ser.", "nature ret society ser."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("nature et society ser.") or ("natural open society ser."))) or ("nature e society sector."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nature et society ser.") OR ("natural open society ser."))) OR ("nature e society sector.")).
• Removing quotes may allow a broader search: (((( nature et society ser. ) or ( natural open society ser. ))) or ( nature e society sector. )).
• Adding a wildcard symbol may retrieve word variants: (((("nature et society ser.") or ("natural open society ser."))) or ("nature e society sector."))*.