Perhaps you should try some spelling variations:
communication network » communication networks, communications network, communications networks
clean development » human development, urban development
development event » development recent, development decent, development seven
can information » von information, von informationen
technology can » technology change, technology 1, technology 2.2
network clean » network cloud, network area, network club
event afrique » en afrique
de mass » de masse, de mais, de masa

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

• Performing a fuzzy search may retrieve terms with similar spellings: technology can information _ de mass communication network clean development event afrique.~.
• Adding a wildcard symbol may retrieve word variants: technology can information _ de mass communication network clean development event afrique.*.