Perhaps you should try some spelling variations:
communication costs » communication systems, communication efforts, communication skills
technologies aids » technologies a, technologies any, technologies fish
clean development » human development, urban development, child development
aids information » hidden information, chief information, award information
information gap » information _, information flow
de mobile » does mobile, _ mobile, a mobile

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

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