Perhaps you should try some spelling variations:
symposion irs » symposium irs, symposion aus, symposion im
symposion des » symposions des, symposion der, symposion uber
das symposia » das symposion, das symposium, rims symposia
a symposia » _ symposia, 2 symposia, 3 symposia

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: (( das ((symposion irs) OR (symposion des)) ) OR ( ((das symposia) OR (a symposia)) series )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( das ((symposion irs) OR (symposion des)) ) or ( ((das symposia) or (a symposia)) series ))".
• Adding a wildcard symbol may retrieve word variants: (( das ((symposion irs) OR (symposion des)) ) or ( ((das symposia) or (a symposia)) series ))*.