Perhaps you should try some spelling variations:
clean development » human development, urban development
communication das » communication dans, communication des, communication data
variation across » variations across, education across, variation series
across children » areas children, across child, across childhood
a communication » la communication, data communication, data communications
development en » developpement en, development menu, development eco
technologie c » technologies 2, technologies 3, technologies 1
c variation » _ variation, 2 variation, 4 variation
children a » children _
das clean » das clan, a clean, das cern

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

• Adding a wildcard symbol may retrieve word variants: technologie c variation across children a communication das clean development en afrique.*.