Perhaps you should try some spelling variations:
"big 1984 conference" » "big 1st conference" (Expand Search), "big 1981st conference" (Expand Search), "big 198ais conference" (Expand Search), "big 198ccf conference" (Expand Search)
"big ds conference" » "big 1st conference" (Expand Search), "big ais conference" (Expand Search), "big duxu conference" (Expand Search)
"big 4 conference" » "big 1st conference" (Expand Search), "big ais conference" (Expand Search), "big ccf conference" (Expand Search), "bi 4 conference" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("big 4 conference") OR ("big ds conference"))) OR ("big 1984 conference"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"big 4 conference\") OR (\"big ds conference\"))) OR (\"big 1984 conference\"))".
• Removing quotes may allow a broader search: (((( big 4 conference ) OR ( big ds conference ))) OR ( big 1984 conference )).
• Adding a wildcard symbol may retrieve word variants: (((("big 4 conference") OR ("big ds conference"))) OR ("big 1984 conference"))*.