Perhaps you should try some spelling variations:
optical communication » optical communications, optic communication, political communication
communication model » communication media
development plan » development plans, development planning, development policy
sem development » term development, team development, item development
plan african » pan african, plan africa, class african
3 optical » _ optical, 3 optimal, 3.3 optical
model sem » model set, model sbm, model sm
gap 3 » gaap 3, gap _, map 3

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

• Adding a wildcard symbol may retrieve word variants: technologies _ information gap 3 optical communication model sem development plan african.*.