Perhaps you should try some spelling variations:
communication skills » communication services, communication systems
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 gaps » information gap, information flows, information needs
development case » development bank, development a, development aid
skills clean » skills human

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