Perhaps you should try some spelling variations:
"la regional conferences" » "la regional conference", "la regional consequences", "la regional differences", "ia regional conferences", "sea regional conferences", "epa regional conferences"
"a regional conferences" » "a regional conference", "a regional consequences", "a regional differences"
"das original conference" » "das regional conference", "das retinal conference", "das optical conference", "his original conference", "its original 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: (((("la regional conferences") OR ("a regional conferences"))) OR ("das original conference"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"la regional conferences\") OR (\"a regional conferences\"))) or (\"das original conference\"))*".
• Removing quotes may allow a broader search: (((( la regional conferences ) OR ( a regional conferences ))) or ( das original conference ))*.