Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
wave communications » face communications, data communications, faso communications
information center » information centers, information centre, information content
developing cross » development cross, developing areas, development across
technologies 2 » technologies _, technologies 4
2.1 developing » 2.2 developing, 2.3 developing, 2.6 developing
cross africa » across africa, across african, crises africa
center how » century how, better how, gender how
costs 2.1 » costs 2.3, costs 4.1, costs 2.2
how wave » how have, how water, how wales

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information center how wave communications costs 2.1 developing cross africa.*.