Perhaps you should try some spelling variations:
information source » information sources, information resource, information resources
de communication » mobile communication, online communication
6.4 developing » 5.4 developing, 3.3 developing, 2.2 developing
source debate » source data, source heat
technology 1 » technology _
developing a » developing _
debate de » debates de, debate we, debatte der
costs 6.4 » costs 4.4, costs 4.2, costs 2.3
a africa » 1 africa, can africa, em africa

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

• Adding a wildcard symbol may retrieve word variants: technology 1 information source debate de communication costs 6.4 developing a africa.*.