Perhaps you should try some spelling variations:
oral communication » personal communication
la developpement » le developpement, de developpement, et developpement
developpement l » developpement il, developpement la, developpement de
des variation » does variation, de variation, der variation
variation de » variation des, variation der, variation due
l afrique » en afrique
de ddr » der ddr, die ddr, dem ddr

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

• Performing a fuzzy search may retrieve terms with similar spellings: (typologie OR typologies) des variation de ddr oral communication a la developpement l afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(typologie OR typologies) des variation de ddr oral communication a la developpement l afrique.*".