Perhaps you should try some spelling variations:
communication system » communication systems, telecommunication system, communication series
change information » chandos information, trade information
oral communication » personal communication
about de » about due, about dead, about debt
de oral » de otras, new oral
technological » technologies

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

• Performing a fuzzy search may retrieve terms with similar spellings: technological change information about de oral communication system a development _ afrique.~.
• Adding a wildcard symbol may retrieve word variants: technological change information about de oral communication system a development _ afrique.*.