Perhaps you should try some spelling variations:
clean development » human development, urban development
de communication » mobile communication, online communication
technology 1 » technology _
relations 19 » relations 1, relations 14, relations 16
1 relations » 3 relations, a relations, 1.2 relations
costs clean » costs clear
crisis de » crisis del, crisis due, crisis debt
a aortic » _ aortic, _ artic

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

• Adding a wildcard symbol may retrieve word variants: technology 1 relations 19 crisis de communication costs clean development a aortic.*.