Perhaps you should try some spelling variations:
information constraints » information contents, information content
oral communication » personal communication
constraints how » constraints short, constraints from, constraints long
technologies 4 » technologies _
4 information » 2 information, 1 information
developing em » developing e, developing eq, developing amp
4 developing » 3 developing
em africa » 1 africa
how oral » how moral, how rural, how arab
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 constraints how oral communication costs 4 developing em africa.*.