Perhaps you should try some spelling variations:
communication modes » communication model, communication des, communication media
oral communication » personal communication
information need » information needs, information needed, information speed
modes human » models human, model human, modern human
a afrique » l afrique, en afrique
need de » need le, need fide, need one
de oral » de otras, new oral

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information need de oral communication modes human development a afrique.*.