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
apologien der » typologien der, apologie des, ideologien der
der variation » de variation, does variation, die variation
using does » using deep, being does, using aes
does oral » does formal, does oil
a de » a die, a der, a des

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

• Adding a wildcard symbol may retrieve word variants: apologien der variation using does oral communication a de developpement durable afrique.*.