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
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
der do » der de, der db, der door

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

• Performing a fuzzy search may retrieve terms with similar spellings: typologie der variation ((der do) OR (der does)) oral communication _ au developpement en afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie der variation ((der do) OR (der does)) oral communication _ au developpement en afrique.*".