Perhaps you should try some spelling variations:
communications systems » communication systems, communications system, communication system
leur developpement » le developpement, deux developpements, de developpement
developpement en » developpement et, developpement des, developpement de
more variation » modes variation, care variation, pose variation
typology more » typology how
variation des » variation _, variation 6, variation series
systems leur » systems lens, systems level, systems legal
cost data » test data
des cost » des ost, des post, des couts

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

• Adding a wildcard symbol may retrieve word variants: typology more variation des cost data communications systems leur developpement en afrique.*.