Perhaps you should try some spelling variations:
oral communication » personal communication
communication 2.1 » communication 22.1, communications 2.1, communication 2.4
key developments » key development, new developments, _ developments
developments des » development desd, developments web, developments codas
variation using » variations during, variation und, variation among
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
des afrique » en afrique, de l'afrique
using does » using deep, being does, using aes
does oral » does formal, does oil
2.1 key » 4.1 key

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation using does oral communication 2.1 key developments des afrique.*.