Perhaps you should try some spelling variations:
oral communication » personal communication
au developpement » du developpement, de developpement, le developpement
developpement en » developpement et, developpement des, developpement de
variation using » variations during, variation und, variation among
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
using es » using aes, using e, using 5s
media au » medias au, media a, media ai
es oral » vs oral, des moral, new oral

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

• Adding a wildcard symbol may retrieve word variants: typology de variation using es oral communication media au developpement en afrique.*.