Perhaps you should try some spelling variations:
2.7 communication » 2.3 communication, 3.2 communication, 2 communication
et developpement » de developpement, le developpement, test development
developpement de » developpement des, developpement durable
can information » von information, von informationen
information war » information what, information wants, information when
technology can » technology change, technology 1, technology 2.2
war coal » hard coal, char coal, raw coal
coal 2.7 » coal 2.2, coale 2.3, coal 3.5
costs et » costs _, costs 4, costs a

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

• Adding a wildcard symbol may retrieve word variants: technology can information war coal 2.7 communication costs et developpement de l'afrique.*.