Perhaps you should try some spelling variations:
data communication » data communications
developpement de » developpement des, developpement durable
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
typology der » typologie der, typologien der, typologie des
costs data » cost data
des costs » gas costs, bus costs, d costs

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

• Adding a wildcard symbol may retrieve word variants: typology der variation des costs data communication media _ developpement de l'afrique.*.