Perhaps you should try some spelling variations:
technology ethnic » technology ethical, technology economic, technology extends
clean development » human development, urban development
ethnic relations » economic relations, public relations
pt communication » put communication, et communication, post communication
relations 14 » relations 1.4, relations 1, relations 4
costs clean » costs clear
14 crisis » 19 crisis, 1 crisis, 11 crisis
crisis pt » crisis _, crisis a
a aortic » _ aortic, _ artic

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

• Adding a wildcard symbol may retrieve word variants: technology ethnic relations 14 crisis pt communication costs clean development a aortic.*.