Perhaps you should try some spelling variations:
retrieval conference » retrieval inference, retrieval preference, retrieval references
national conference » international conference
retinal conference » regional conference, regional conferences, original conference
dense retrieval » case retrieval, phase retrieval, scene retrieval

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