Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
technologies debt » technologies de, technologies art, technologies bit
debt information » student information, credit information, budget information
information gaps » information gap
per development » power development, spur development, oer developments
does mobile » das mobile
gaps does » gaps notes, gaps do, guns does

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