Perhaps you should try some spelling variations:
radio communications » radio communication, data communications
does developpement » de developpement, des developpements, does development
developpement en » developpement et, developpement des, developpement de
variation forms » variation from, variation notes, variation series
typologie does » typologie des, typologie der, typologie cices
does variation » de variation, der variation, die variation
forms de » formes de, formas de, forme de
de radio » dm radio, desi radio, mode radio

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

• Adding a wildcard symbol may retrieve word variants: typologie does variation forms de radio communications _ does developpement en afrique.*.