Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
clean development » human development, urban development
technology trade » technology trends, technology transfer, technology transfers
2 communications » 2 communication, 3 communications, 4 communications
integration dow » integration do, integration does, integration der
costs clean » costs clear
dow goes » dow jones, d goes, der goes
goes 2 » goes _, goes 4, goes a

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

• Adding a wildcard symbol may retrieve word variants: technology trade integration dow goes 2 communications costs clean development africa case.*.