Perhaps you should try some spelling variations:
actors communication » actions communication, active communication, networks communication
communication system » communication systems, telecommunication system, communication series
clean development » human development, urban development
development plan » development plans, development planning, development policy
information 1.2 » information 1.5.2, information 2
technologies 2 » technologies _, technologies 4
system clean » systems clean, system clear, system can
plan african » pan african, plan africa, class african
2 actors » _ actors, 3 actors, 5 actors
1.2 2 » 1.2 _, 1.2 a, 1.2 r

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

• Adding a wildcard symbol may retrieve word variants: technologies 2 information 1.2 2 actors communication system clean development plan african.*.