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

You may be able to get more results by adjusting your search query.

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