Perhaps you should try some spelling variations:
oral communication » personal communication
der developpement » de developpement, des developpements, leur developpement
variation series » education series, action series, edition series
developpement en » developpement et, developpement des, developpement de
communication 2 » communication _, communication a, communication 3
des variation » does variation, de variation, der variation
typology des » typologie des, typologie der, typology _
series dem » series de, series nejm, series d
dem oral » dem gral, dem ort
2 der » _ der

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

• Adding a wildcard symbol may retrieve word variants: typology des variation series dem oral communication 2 der developpement en afrique.*.