Perhaps you should try some spelling variations:
"23rd workshop session part" » "23rd workshop series part", "3rd workshop session part", "2nd workshop session part", "237 workshop session part", "23rd workshop sessions part", "23rd workshop succession part", "23rd workshop session papers"
"world wars discussion paper" » "world mars discussion paper", "world war discussion paper", "world dwarfs discussion paper", "world wars discussion papers"

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: (("world wars discussion paper") OR ("23rd workshop session part")).
• Removing quotes may allow a broader search: (( world wars discussion paper ) or ( 23rd workshop session part )).
• Adding a wildcard symbol may retrieve word variants: (("world wars discussion paper") or ("23rd workshop session part"))*.