Perhaps you should try some spelling variations:
oral communication » personal communication
separation using » operation using, separation among, separation und
de developpement » sme development
developpement de » developpement des, developpement durable
des separation » ree separation, order separation, post separation
typology des » typologie des, typologie der, typology _
using does » using deep, being does, using aes
does oral » does formal, does oil

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

• Adding a wildcard symbol may retrieve word variants: typology des separation using does oral communication _ de developpement de l'afrique.*.