Perhaps you should try some spelling variations:
technologies energy » technologies new, technologies any
communication costs » communication systems, communication efforts, communication skills
clean development » human development, urban development, child development
la communication » _ communication, mass communication, oral communication
development case » development bank, development a, development aid

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

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