Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
information centre » information centers, information contents
technologien zur » technologien fur, technologien des, technologien und
zur information » fur information, your information, der information
developing a » developing _
de optical » _ optical, 3 optical, 12 optical
centre de » centre _, centrale des
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: technologien zur information centre de optical communication costs _ developing a africa.*.