Perhaps you should try some spelling variations:
"uni shells / http://id.loc.gov/authorities/names/n93002992" » "i shells / http://id.loc.gov/authorities/names/n93002992", "si shells / http://id.loc.gov/authorities/names/n93002992", "conic shells / http://id.loc.gov/authorities/names/n93002992", "uni shells / http://id.loc.gov/authorities/james/n93002992"
"hi shells / http://id.loc.gov/authorities/names/n93002992" » "_ shells / http://id.loc.gov/authorities/names/n93002992", "hi shells / http://id.loc.gov/authorities/james/n93002992"
"ii shells / http://id.loc.gov/authorities/names/n93002992" » "ii shell / http://id.loc.gov/authorities/names/n93002992", "die shells / http://id.loc.gov/authorities/names/n93002992", "_ shells / http://id.loc.gov/authorities/names/n93002992", "ii shells / http://id.loc.gov/authorities/james/n93002992"
"unix shells / http://id.loc.gov/authorities/names/n93002992" » "unix shells / http://id.loc.gov/authorities/james/n93002992", "unit shells / http://id.loc.gov/authorities/names/n93002992", "univ shells / http://id.loc.gov/authorities/names/n93002992", "unis shells / http://id.loc.gov/authorities/names/n93002992"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("uni shells / http://id.loc.gov/authorities/names/n93002992") OR ("hi shells / http://id.loc.gov/authorities/names/n93002992"))) OR ("unix shells / http://id.loc.gov/authorities/names/n93002992"))) OR ("ii shells / http://id.loc.gov/authorities/names/n93002992")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"uni shells / http://id.loc.gov/authorities/names/n93002992\") OR (\"hi shells / http://id.loc.gov/authorities/names/n93002992\"))) or (\"unix shells / http://id.loc.gov/authorities/names/n93002992\"))) or (\"ii shells / http://id.loc.gov/authorities/names/n93002992\"))".
• Removing quotes may allow a broader search: (((((( uni shells / http://id.loc.gov/authorities/names/n93002992 ) OR ( hi shells / http://id.loc.gov/authorities/names/n93002992 ))) or ( unix shells / http://id.loc.gov/authorities/names/n93002992 ))) or ( ii shells / http://id.loc.gov/authorities/names/n93002992 )).
• Adding a wildcard symbol may retrieve word variants: (((((("uni shells / http://id.loc.gov/authorities/names/n93002992") OR ("hi shells / http://id.loc.gov/authorities/names/n93002992"))) or ("unix shells / http://id.loc.gov/authorities/names/n93002992"))) or ("ii shells / http://id.loc.gov/authorities/names/n93002992"))*.