Perhaps you should try some spelling variations:
communication costs » communication systems, communication efforts, communication skills
technologies debt » technologies new, technologies ict, technologies sector
clean development » human development, urban development, child development
debt information » student information, credit information, health information
information age » information gaps, information laws, information _
a mobile » _ mobile
age a » age _

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

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