Perhaps you should try some spelling variations:
get communication » et communication, debt communication, de communication
clean development » human development, urban development
technology case » technology based, technology can, technology change
case relations » race relations, case reflections, create relations
relations 3.9 » relations 3.1, relations 3.2, relations 3.3
costs clean » costs clear
3.9 across » 19 across
across get » across ages, across new, across age

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

• Adding a wildcard symbol may retrieve word variants: technology case relations 3.9 across get communication costs clean development _ artic.*.