Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
river development » driven development, water development, power development
technology level » technology never, technology leader, technology led
level mediation » level education, level variation, level reduction
a communication » la communication, data communication, data communications
mediation key » edition key, mediation der, motivation key
key politics » key policies, eu politics, pay politics
politics a » politics _
cost river » cost drivers, coast rivers, cost driven

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

• Adding a wildcard symbol may retrieve word variants: technology level mediation key politics a communication cost river development _ artic.*.