Perhaps you should try some spelling variations:
"nature _ society sector." » "nature _ social sector.", "nature _ society actors."
"nature host society ser." » "nature food society ser.", "nature post society ser.", "natural host society ser.", "nature whose society ser.", "nature host societe ser.", "nature host society self.", "nature host society sri."
"nature open society ser." » "nature open societe ser.", "nature open society self.", "nature open society sri.", "capture open society ser.", "natural open society ser.", "nature en 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 host society ser.") or ("nature open society ser."))) or ("nature _ society sector."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nature host society ser.") OR ("nature open society ser."))) OR ("nature _ society sector.")).
• Removing quotes may allow a broader search: (((( nature host society ser. ) or ( nature open society ser. ))) or ( nature _ society sector. )).
• Adding a wildcard symbol may retrieve word variants: (((("nature host society ser.") or ("nature open society ser."))) or ("nature _ society sector."))*.