Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
information center » information centers, information centre, information content
technologies 2.1 » technologies _, technologies 4, technologies a
en communication » open communication, lean communication, when communication
2.1 information » 3.1 information
developing east » development east, developing a, developing asia
2.3 developing » 3.3 developing, 2.2 developing, 1.3 developing
east africa » west africa
center 3.1 » center 2.1, center 4.1, century 3.1
cost 2.3 » costs 2.3, cost 2.4, cost 2.2
3.1 en » 3.1 ein, 3.1 el, 3.1 eu

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 3.1 en communication cost 2.3 developing east africa.*.