Perhaps you should try some spelling variations:
clean development » human development, urban development
pt communication » put communication, et communication, post communication
development aid » development a, development africa, development agenda
relating 13.3 » relations 3.3, relation 3.3, setting 13.3
technology 3 » technology _, technology 1, technology 4
13.3 crisis » 13.2 crisis, 3.1 crisis, 1.1 crisis
costs clean » costs clear
3 relating » 23 relating, _ relating, 4 relating
crisis pt » crisis _, crisis a

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

• Adding a wildcard symbol may retrieve word variants: technology 3 relating 13.3 crisis pt communication costs clean development aid aortic.*.