Perhaps you should try some spelling variations:
developpement durable » developpement de
oral communication » personal communication
de developpement » sme development
variation using » variations during, variation und, variation among
typologie does » typologie des, typologie der, typologie cices
does variation » de variation, der variation, die variation
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: typologie does variation using does oral communication _ de developpement durable afrique.*.