Perhaps you should try some spelling variations:
"la original conference" » "la regional conference", "la retinal conference", "la regional conferences", "2 original conference", "1 original conference", "3 original conference", "l2 original conference", "l1 original conference", "l3 original conference"
"_ original conference" » "_ regional conference", "_ retinal conference", "_ regional conferences"
"a original conference" » "a regional conference", "a retinal conference", "a regional conferences", "2 original conference", "1 original conference", "3 original conference"
"das original conference" » "das regional conference", "das retinal conference", "das regional conferences", "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 ("_ original conference"))) OR ("a original conference"))) OR ("das original conference")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"la original conference\") OR (\"_ original conference\"))) or (\"a original conference\"))) or (\"das original conference\"))".
• Removing quotes may allow a broader search: (((((( la original conference ) OR ( _ original conference ))) or ( a original conference ))) or ( das original conference )).
• Adding a wildcard symbol may retrieve word variants: (((((("la original conference") OR ("_ original conference"))) or ("a original conference"))) or ("das original conference"))*.