Perhaps you should try some spelling variations:
"das regional conferences" » "das regional conference", "das regional consequences", "das regional differences", "das regionale conferences", "gas regional conferences", "dawns regional conferences"
"la original conference" » "la regional conference", "la retinal conference", "la optical conference", "_ original conference", "2 original conference", "1 original conference", "l_ original conference", "l2 original conference", "l1 original conference"
"a original conference" » "a regional conference", "a retinal conference", "a optical conference", "_ original conference", "2 original conference", "1 original conference"
"das original conference" » "das regional conference", "das retinal conference", "das optical conference", "his original conference", "its original conference"

Try widening your search to All Fields.

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 original conference") OR ("a original conference"))) OR ((("das original conference") OR ("das regional conferences")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"la original conference\") or (\"a original conference\"))) or (((\"das original conference\") OR (\"das regional conferences\"))))".
• Removing quotes may allow a broader search: (((( la original conference ) or ( a original conference ))) or ((( das original conference ) OR ( das regional conferences )))).
• Adding a wildcard symbol may retrieve word variants: (((("la original conference") or ("a original conference"))) or ((("das original conference") OR ("das regional conferences"))))*.