Perhaps you should try some spelling variations:
formalen communication » informal communication, complex communication, force communication
developpement de » developpement des, developpement durable
variation using » variations during, variation und, variation among
a developpement » au developpement, de developpement, le developpement
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
pes formalen » des formalen, der formalen, des normalen
using pes » using pdes, using pecs, using pets
media a » media _, media 1, media 3

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

• Adding a wildcard symbol may retrieve word variants: apologien der variation using pes formalen communication media a developpement de l'afrique.*.