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
technology its » technology isst, technology ict, technology ii
relation 14.3 » relations 14.3, relation 4.3, relations 4.3
its relation » its relationship
14.3 crisis » 13.3 crisis, 1.1 crisis, 10.2 crisis
costs clean » costs clear
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 its relation 14.3 crisis pt communication costs clean development aid aortic.*.