Perhaps you should try some spelling variations:
called communication » based communication, scale communication, scales communication
clean development » human development, urban development
crisis called » crisis changed, crisis charles, crisis causes
technology 2 » technology _, technology 1, technology 3
costs clean » costs clear
2 relation » 5 relation, 4 relation, 6 relation
relation a » relation _, relational _, relation zur
a crisis » 19 crisis

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

• Adding a wildcard symbol may retrieve word variants: technology 2 relation a crisis called communication costs clean development _ artic.*.