Perhaps you should try some spelling variations:
leur developpement » le developpement, deux developpements, de developpement
information step » information steve, information system, information states
developpement en » developpement et, developpement des, developpement de
4 communication » 3 communication, 5.4 communication, de communication
systems leur » systems lens, systems level, systems legal
step time » steam time, deep time, step size
time 4 » time _, time a, time 1

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ information step time 4 communication systems leur developpement en afrique.~.
• Adding a wildcard symbol may retrieve word variants: technologies _ information step time 4 communication systems leur developpement en afrique.*.