Perhaps you should try some spelling variations:
variation series » education series, action series, edition series
ou developpement » du developpement, au developpement, de developpement
developpement de » developpement des, developpement durable
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
series ties » series bias, series studies, series trends
ties data » studies data

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation series ties data communications _ ou developpement de l'afrique.*.