Perhaps you should try some spelling variations:
communication cost » communication costs, communication costa, communications costs
3.2 communication » 3 communication, 2.3 communication, de communication
urban development » human development
development lie » development life, development li, development lid
population age » population change, population aging, population data
technology de » technology does, technology dlt, technology 1
de population » do population, deer population, does population
lie afrique » l afrique
cost urban » most urban, worst urban, bust urban
age sites » case sites, age ses, aim sites
sites 3.2 » states 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology de population age sites 3.2 communication cost urban development lie afrique.*.