Perhaps you should try some spelling variations:
oral communication » personal communication
developpement la » developpement de, developpement et, developpement du
variation des » variation _, variation 6, variation series
topologie 3 » topologien 3, topologie 1, topologie 2
3 variation » 3 variations, 2 variation, 4 variation
des ddr » der ddr, des dr, dem ddr
3 des » 3 der, 3 das, a des
3 de » 3 die, 3 der, _ de
fabrique.* » afrique.*, fabrice.*

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

• Performing a fuzzy search may retrieve terms with similar spellings: topologie 3 variation des ddr oral communication ((3 de) OR (3 des)) developpement la fabrique.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "topologie 3 variation des ddr oral communication ((3 de) OR (3 des)) developpement la fabrique.*".