Perhaps you should try some spelling variations:
oral communication » personal communication
technologies do » technologies de, technologies box, technologies daf
do information » 2 information, 1 information, 3 information
contents based » content based, context based, contents fase
4 developing » 3 developing
developing a » developing _
based oral » based rural, based modal
a african » _ african, 1 african, 2 african
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 do information contents based oral communication costs 4 developing a african.*.