Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
get communication » et communication, debt communication, de communication
technologies 3.1 » technologies 2.1, technologies 3.2, technologies _
2.2 developing » 3.2 developing, 3.3 developing, 2.2 development
developing can » developing a, developing ai, developing av
contents 4.4 » contents 4.1, contents 15.4, contents 3.1
can africa » urban africa
cost 2.2 » costs 2.2, cost 2.4, cost 3.2
4.4 get » 4.4 ge, 5.4 get, 15.4 get

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

• Adding a wildcard symbol may retrieve word variants: technologies 3.1 information contents 4.4 get communication cost 2.2 developing can africa.*.