Perhaps you should try some spelling variations:
oral communication » personal communication
developpement et » developpement des, developpement de, development east
variation bei » variation des, variation der, variation _
et afrique » en afrique, l afrique
den oral » den ort, new oral
bei den » bei der
a aus » _ aus, a auf, i aus
a au » a auf, a bau, a a

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typology _ variation bei den oral communication ((a au) OR (a aus)) developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology _ variation bei den oral communication ((a au) OR (a aus)) developpement et afrique.*.