Perhaps you should try some spelling variations:
clean development » human development, urban development
technologies can » technologies a, technologies co, technologies _
can information » von information, von informationen
costs clean » costs clear
a afrique » l afrique, en afrique
about de » about due, about dead, about debt

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies can information about de _ communication costs clean development a afrique.~.
• Adding a wildcard symbol may retrieve word variants: technologies can information about de _ communication costs clean development a afrique.*.