Perhaps you should try some spelling variations:
"23rd int study" » "23rd iot study", "23rd joint study", "23rd point study", "3rd iet study", "3rd intl study", "23rd oct study"
"23rd dip study" » "23rd dipp study", "23rd deep study", "23rd up study", "23rd ifip study", "23rd aipr study", "23rd cirp study"
"23rd i.e study" » "23rd ieee study"

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: (((("23rd i.e study") OR ("23rd int study"))) OR ("23rd dip study")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"23rd i.e study\") OR (\"23rd int study\"))) or (\"23rd dip study\"))".
• Removing quotes may allow a broader search: (((( 23rd i.e study ) OR ( 23rd int study ))) or ( 23rd dip study )).
• Adding a wildcard symbol may retrieve word variants: (((("23rd i.e study") OR ("23rd int study"))) or ("23rd dip study"))*.