Perhaps you should try some spelling variations:
data communication » data communications
a developpement » au developpement, de developpement, le developpement
variation des » variation _, variation 6, variation series
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
des afrique » en afrique, de l'afrique
cost data » test data
des cost » des ost, des post, des couts
systems » system

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

• Adding a wildcard symbol may retrieve word variants: typology de variation des cost data communication systems a developpement des afrique.*.