Perhaps you should try some spelling variations:
radio communications » radio communication, data communications
developpement en » developpement et, developpement des, developpement de
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
variation der » variation des, variation bei, variation _
dm radio » im radio, fm radio, das radio
der dm » der de, der db
a der » _ der, 2 der, 1 der
3 der » _ der, 2 der

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: "typologie der variation der dm radio communications ((a der) OR (3 der)) developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie der variation der dm radio communications ((a der) OR (3 der)) developpement en afrique.*.