Perhaps you should try some spelling variations:
"delay retrieval conference" » "delay retrieval inference", "delay retrieval preference", "delay retrieval references", "melody retrieval conference", "key retrieval conference", "cell retrieval conference"
"elgar retinal conference" » "elgar regional conference", "elgar regional conferences", "elgar national conference", "tear retinal conference", "elga retinal conference", "elgtear retinal conference", "elgcat retinal conference"
"ar retinal conference" » "ar regional conference", "ar regional conferences", "ar national conference", "a retinal conference", "tear retinal conference", "cat retinal conference"

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: (((("elgar retinal conference") OR ("ar retinal conference"))) OR ("delay retrieval conference")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elgar retinal conference\") OR (\"ar retinal conference\"))) or (\"delay retrieval conference\"))".
• Removing quotes may allow a broader search: (((( elgar retinal conference ) OR ( ar retinal conference ))) or ( delay retrieval conference )).
• Adding a wildcard symbol may retrieve word variants: (((("elgar retinal conference") OR ("ar retinal conference"))) or ("delay retrieval conference"))*.