Perhaps you should try some spelling variations:
oral communication » personal communication
variation series » education series, action series, edition series
la developpement » le developpement, de developpement, et developpement
developpement de » developpement des, developpement durable
des variation » does variation, de variation, der variation
series der » serien der, series de, series d
de afrique » de l'afrique, en afrique, l afrique
der oral » der moral, der ort, der orte
typologie » typologies, typology

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

• Adding a wildcard symbol may retrieve word variants: typologie des variation series der oral communication _ la developpement de afrique.*.