Perhaps you should try some spelling variations:
personal communication » interpersonal communication
information century » information centers, information centre, information center
technologies 4 » technologies _
4 information » 2 information, 1 information
developing em » developing e, developing eq, developing amp
century 1945 » century 19.5, century 1900, century 185
4 developing » 3 developing
em africa » 1 africa
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies 4 information century 1945 personal communication costs 4 developing em africa.*.