Perhaps you should try some spelling variations:
class communication » mass communication, plans communication, crisis communication
developed country » developed countries, developing country
technologies 4.1 » technologies 2.1, technologies 3.1, technologies 3.2
4.1 integration » 3.3 integration, 4 integration, 3 integration
human developed » human development, human developing, human developments
integration 4 » integration 3
costs human » sts human, ghosts humans, beasts human
role class » whole class, race class, one class
4 role » 3 role

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

• Adding a wildcard symbol may retrieve word variants: technologies 4.1 integration 4 role class communication costs human developed country risk.*.