Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
local development » social development, global development, rural development
development lie » development life, development li, development lid
risk infection » risk infectious, risky injection, right infection
infection data » infection rate, infection rates, section data
lie afrique » l afrique
data race » data rate, data rates
race 6.2 » grace 6.2, race 4.2, race 6.4

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

• Adding a wildcard symbol may retrieve word variants: technology risk infection data race 6.2 communication costs local development lie afrique.*.