Perhaps you should try some spelling variations:
21st communication » post communication, 2.3 communication, csr communication
communication cost » communication costs, communication costa, communications costs
development center » development case
urban development » human development
technology e.g » technology 2.2, technology 3.1, technology 2.1
location based » population based
based politics » based policies, flawed politics, nested politics
e.g location » 2.1 location, 3.1 location, 3.2 location
cost urban » most urban, worst urban, bust urban
center car » center can, center case, center harc

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

• Adding a wildcard symbol may retrieve word variants: technology e.g location based politics 21st communication cost urban development center car.*.