Perhaps you should try some spelling variations:
"nature e social sector." » "nature e social sectors.", "nature de social sector.", "nature en social sector.", "nature re social sector.", "nature e sociali sector.", "nature use social sector.", "nature age social sector."
"nature et society ser." » "nature et societe ser.", "nature et society self.", "nature et society sri.", "nature e society ser.", "nature et societes ser.", "nature det society ser.", "nature ent society ser.", "nature ret society ser."
"nature _ society ser." » "nature _ societe ser.", "nature _ society self.", "nature _ society sri."

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 ("nature _ society ser."))) or ("nature e social sector."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nature et society ser.") OR ("nature _ society ser."))) OR ("nature e social sector."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nature et society ser.\") OR (\"nature _ society ser.\"))) or (\"nature e social sector.\"))*".
• Removing quotes may allow a broader search: (((( nature et society ser. ) OR ( nature _ society ser. ))) or ( nature e social sector. ))*.