Perhaps you should try some spelling variations:
"things proceedings in complexity" » "its proceedings in complexity", "ions proceedings in complexity"
"rings proceedings in complexity" » "its proceedings in complexity", "ions proceedings in complexity", "areas proceedings in complexity"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"rings proceedings in complexity\") OR (\"things proceedings in complexity\"))".
• Removing quotes may allow a broader search: (( rings proceedings in complexity ) OR ( things proceedings in complexity )).
• Adding a wildcard symbol may retrieve word variants: (("rings proceedings in complexity") OR ("things proceedings in complexity"))*.