Perhaps you should try some spelling variations:
communication services » telecommunications services
oral communication » personal communication
variation series » education series, action series, edition series
au developpement » du developpement, de developpement, le developpement
developpement en » developpement et, developpement des, developpement de
typologien does » typologie des, typologien der, typologie der
does variation » de variation, der variation, die variation
services au » services a, services ad, services ai
series ex » series e, series new, series ein
ex oral » new oral

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

• Adding a wildcard symbol may retrieve word variants: typologien does variation series ex oral communication services au developpement en afrique.*.