Perhaps you should try some spelling variations:
oral communication » personal communication
communication cpss » communication costs, communication cross, communication case
development state » development stage, developmental state, redevelopment state
technology 3.1 » technology 1, technology 2.2, technology _
state africa » trade africa
cpss world » crisis world, across world
from oral » from moral, from rural, from oil
gap from » gaps from, map from, gdp from

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

• Adding a wildcard symbol may retrieve word variants: technology 3.1 information gap from oral communication cpss world development state africa.*.