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 4 » technology _, technology 1, technology 3
4 relations » 3 relations, 4 relation, 1 relations
relations 3 » relations _, relations a
costs clean » costs clear
crisis pt » crisis _, crisis a
3 crisis » 1 crisis, 19 crisis

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

• Adding a wildcard symbol may retrieve word variants: technology 4 relations 3 crisis pt communication costs clean development aid aortic.*.