Perhaps you should try some spelling variations:
"23rd ieee study" » "23rd ieeg study", "23rd ieee std", "23rd csee study", "3rd ieee study", "2nd ieee study", "22nd ieee study"
"23rd ifip study" » "23rd dip study", "23rd itp study", "22nd ifip study"
"23rd rflp study" » "23rd help study", "23rd nlp study", "23rd rhp 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 ieee study") OR ((("23rd ifip study") OR ("23rd rflp study")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"23rd ieee study\") or (((\"23rd ifip study\") OR (\"23rd rflp study\"))))".
• Removing quotes may allow a broader search: (( 23rd ieee study ) or ((( 23rd ifip study ) OR ( 23rd rflp study )))).
• Adding a wildcard symbol may retrieve word variants: (("23rd ieee study") or ((("23rd ifip study") OR ("23rd rflp study"))))*.