Perhaps you should try some spelling variations:
cell communications » cell communication, health communications, rural communications
developpements des » developpement des, developpements de, developpement de
typologies des » typologie des, typologie der, typologien der
des variation » does variation, de variation, der variation
variation a » variation _, variation 6, variation 5
des afrique » en afrique, de l'afrique
do cell » dc cell, does cell, dry cell
a der » 2 der, 3 der, 1 der
a do » a dot, _ do, a d

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

• If you are trying to use Boolean operators, they must be ALL CAPS: typologies des variation a do cell communications ((a der) OR (_ der)) developpements des afrique.~.
• Adding a wildcard symbol may retrieve word variants: typologies des variation a do cell communications ((a der) or (_ der)) developpements des afrique.*.