Perhaps you should try some spelling variations:
information centers » information contents, information officers
communication cost » communication costs, communication costa, communications costs
technologies 2.1 » technologies _, technologies 4, technologies a
el communication » cell communication, real communication, 3 communication
2.1 information » 3.1 information
2.2 developing » 3.2 developing, 3.3 developing, 2.2 development
developing can » developing a, developing ai, developing av
centers 3.4 » centers 3.3, centers 3.8, centers 12.4
can africa » urban africa
cost 2.2 » costs 2.2, cost 2.4, cost 3.2
3.4 el » 2.4 el, 3.4 eq, 3.4 et

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

• Adding a wildcard symbol may retrieve word variants: technologies 2.1 information centers 3.4 el communication cost 2.2 developing can africa.*.