Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
clean development » human development, urban development
development class » development case, development cross, development cases
2 communications » 2 communication, 3 communications, 4 communications
class americans » las americas, states americans
technologies 4 » technologies _
4 information » 2 information, 1 information
information 3 » information 2
costs clean » costs clear

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 information 3 2 2 communications costs clean development class americans.*.