Perhaps you should try some spelling variations:
"big ofthe conference" » "big oate conference", "big atthe conference", "big late conference", "big often conference", "big other conference"
"big fifth conference" » "big 5th conference", "big 6th conference", "big 8th conference", "big fish conference", "his fifth conference", "bjt fifth conference"
"big open conference" » "big european conference", "big europe conference", "big asian conference", "big one conference", "big ben conference"

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: (("big open conference") OR ((("big ofthe conference") OR ("big fifth conference")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"big open conference\") or (((\"big ofthe conference\") OR (\"big fifth conference\"))))".
• Removing quotes may allow a broader search: (( big open conference ) or ((( big ofthe conference ) OR ( big fifth conference )))).
• Adding a wildcard symbol may retrieve word variants: (("big open conference") or ((("big ofthe conference") OR ("big fifth conference"))))*.