Perhaps you should try some spelling variations:
clean development » human development, urban development
de communication » mobile communication, online communication
technology dlt » technology data, technology debts, technology 21st
relating 13.3 » relations 3.3, relation 3.3, setting 13.3
dlt relating » data relating, _ relating, law relating
13.3 crisis » 13.2 crisis, 3.1 crisis, 1.1 crisis
costs clean » costs clear
crisis de » crisis del, crisis due, crisis debt

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

• Adding a wildcard symbol may retrieve word variants: technology dlt relating 13.3 crisis de communication costs clean development _ aortic.*.