Perhaps you should try some spelling variations:
oral communication » personal communication
variation reading » tradition reading, variation among, variation using
auf developpement » au developpement, du developpement, ou developpement
developpement de » developpement des, developpement durable
der variation » de variation, does variation, die variation
typology der » typologie der, typologien der, typologie des
reading does » lending does, reading die, reading books
does oral » does formal, does oil
a auf » i auf, b auf

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

• Adding a wildcard symbol may retrieve word variants: typology der variation reading does oral communication a auf developpement de l'afrique.*.