Perhaps you should try some spelling variations:
optical communications » optic communication, political communication, digital communications
communications costs » communication costs, communications _
technologies 2 » technologies _, technologies 4
de optical » _ optical, 3 optical, 12 optical
a afrique » l afrique, en afrique
about de » about due, about dead, about debt
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information about de optical communications costs a development a afrique.*.