Perhaps you should try some spelling variations:
"german aerospace cluster" » "emc aerospace cluster", "german space cluster"
"global aerospace cluster" » "global workspace cluster", "global cyberspace cluster", "global space cluster"
"global aerospace system" » "global workspace system", "global cyberspace system", "global space system", "global aerospace systems"

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: (("german aerospace cluster") OR ((("global aerospace cluster") OR ("global aerospace system")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"german aerospace cluster\") or (((\"global aerospace cluster\") OR (\"global aerospace system\"))))".
• Removing quotes may allow a broader search: (( german aerospace cluster ) or ((( global aerospace cluster ) OR ( global aerospace system )))).
• Adding a wildcard symbol may retrieve word variants: (("german aerospace cluster") or ((("global aerospace cluster") OR ("global aerospace system"))))*.