Perhaps you should try some spelling variations:
optical communications » optic communication, political communication, digital communications
communications costs » communication costs, communications _
technologies ict » technologies icts, technologies iot, technologies art
ict information » ct information, iot information, ist information
4 development » 2 development, 4 developing
de optical » _ optical, 3 optical, 12 optical
a afrique » l afrique, en afrique
about de » about due, about dead, about debt
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technologies ict information about de optical communications costs 4 development a afrique.*.