Perhaps you should try some spelling variations:
postal communication » post communication, oral communication, visual communication
communication 23.5 » communication 23.3, communication 24.5, communication 2.3.3
du developpement » de developpement, le developpement, et developpement
developpement de » developpement des, developpement durable
des variation » does variation, de variation, der variation
variation 6 » variation _, variations _, variation des
der postal » der apostel, der post, der posten
6 der » _ der, 2 der, 3 der
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 6 der postal communication 23.5 du developpement de l'afrique.*.