Perhaps you should try some spelling variations:
oral communication » personal communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
de variation » der variation, die variation, does variation
apologia de » tipologia de, apologie des, apologia _
des dem » des der, des des, des deux
das dem » das der, das den, das drei

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

• Performing a fuzzy search may retrieve terms with similar spellings: apologia de variation ((des dem) OR (das dem)) oral communication _ de developpement en afrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "apologia de variation ((des dem) OR (das dem)) oral communication _ de developpement en afrique.*".