Perhaps you should try some spelling variations:
clean development » human development, urban development
3.2 relationship » 3.3 relationship, a relationship, 4 relationship
de communication » mobile communication, online communication
relationship re » relationship _, relationship a, relationship 4
technology 3.2 » technology 2.2, technology 3.1, technology 2
costs clean » costs clear
re crisis » pre crisis, de crisis, care crisis
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 3.2 relationship re crisis de communication costs clean development a aortic.*.