Perhaps you should try some spelling variations:
radio communications » radio communication, data communications
developpement de » developpement des, developpement durable
typologie does » typologie des, typologie der, typologie cices
does variation » de variation, der variation, die variation
variation behn » variation bei, variation des, variation der
de afrique » de l'afrique, en afrique, l afrique
a radio » _ radio
behn a » behn _
a der » _ der, 2 der, 3 der
a de » a die, a des, _ de

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