Perhaps you should try some spelling variations:
communication costs » communication systems, communication efforts, communication skills
technologies debt » technologies new, technologies ict, technologies sector
debt information » student information, credit information, health information
per development » power development, spur development, power developments
information et » information act, information _, information need
costs per » cost per
et does » der does

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• Performing a fuzzy search may retrieve terms with similar spellings: Technologies debt information et does mobile communication costs per development _ Afrique.~.
• Adding a wildcard symbol may retrieve word variants: Technologies debt information et does mobile communication costs per development _ Afrique.*.