Perhaps you should try some spelling variations:
"23rd cirp study" » "23rd cidnp study", "23rd cissp study", "23rd erp study", "3rd cirp study"
"23rd dip study" » "23rd dipp study", "23rd deep study", "23rd up study", "23rd ifip study", "23rd aipr study", "23rd day study"
"23rd i.e study" » "23rd ieee study", "23rd int 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 dip study") OR ("23rd cirp study")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"23rd i.e study\") or (((\"23rd dip study\") OR (\"23rd cirp study\"))))".
• Removing quotes may allow a broader search: (( 23rd i.e study ) or ((( 23rd dip study ) OR ( 23rd cirp study )))).
• Adding a wildcard symbol may retrieve word variants: (("23rd i.e study") or ((("23rd dip study") OR ("23rd cirp study"))))*.