Perhaps you should try some spelling variations:
"its original conference" » "its regional conference", "its retinal conference", "its regional conferences", "its origin conference", "his original conference"
"sea regional differences" » "asean regional differences", "asia regional differences", "a regional differences"
"la regional differences" » "a regional differences", "ia regional differences", "epa regional differences"

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: (((("la regional differences") OR ("sea regional differences"))) OR ("its original conference"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"la regional differences\") OR (\"sea regional differences\"))) or (\"its original conference\"))*".
• Removing quotes may allow a broader search: (((( la regional differences ) OR ( sea regional differences ))) or ( its original conference ))*.