Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
information center » information centers, information centre, information content
ein communication » sign communication, lean communication, benin communications
technologies 2.1 » technologies _, technologies 4, technologies a
developing urban » development urban, developing human, developing areas
2.1 information » 3.1 information
3.4 developing » 13.4 developing, 3.3 developing, 3.2 developing
urban africa » urban area
center 4.4 » center 4.1, centers 4.3, center 2.1
cost 3.4 » cost 2.4, cost 3.2, cost 3.5
4.4 ein » 4.4 eine, 3.4 ein

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 center 4.4 ein communication cost 3.4 developing urban africa.*.