Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication mode » communication model, communication modes, communication module
development plan » development plans, development planning, development policy
3 information » 1 information
3 development » 2 development
technology 3 » technology _, technology 1, technology 4
plan african » pan african, plan africa, class african
de optical » _ optical, 3 optical, 12 optical
mode 3 » mode _, mode 1, mode 4

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

• Adding a wildcard symbol may retrieve word variants: technology 3 information _ de optical communication mode 3 development plan african.*.