Perhaps you should try some spelling variations:
communication 7.3 » communications 7.3, communication 3.3, communication 4.3
development urban » development bank, development band, development update
city development » capacity development, policy development, community development
information age » information storage, information access, information about
die mobile » does mobile, das mobile, day mobile
urban area » urban areas
7.3 city » 4.3 city, 7.5.3 city
age die » lage die, age de, frage die

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information age die mobile communication 7.3 city development urban area.*.