Perhaps you should try some spelling variations:
clean development » human development, urban development
pt communication » put communication, et communication, post communication
development ahd » development aid, development aids, development a
relations 2.1 » relations 3.1, relations 1, relations _
technology 3 » technology _, technology 1, technology 4
3 relations » et relations, des relations
costs clean » costs clear
2.1 crisis » 3.1 crisis, 2010 crisis, 2011 crisis
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 relations 2.1 crisis pt communication costs clean development ahd aortic.*.