Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
population level » population center, population age, population based
developpement il » developpement de, developpement et, developpement du
technology 1 » technology _
1 population » 2 population, 4 population, 2.1 population
level price » level pre, level privacy, level process
il afrique » l afrique, en afrique
price 3.2 » prices 3.2, price 2.2, rice 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology 1 population level price 3.2 communication costs _ developpement il afrique.*.