Perhaps you should try some spelling variations:
composition series » composition studies, composition properties
das composition » gas composition, gas compositions, iaas composition
symposion irs » symposium irs, symposion des, symposion aus

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 ( das composition series )).
• Adding a wildcard symbol may retrieve word variants: (( das symposion irs ) or ( das composition series ))*.