Perhaps you should try some spelling variations:
4.2 communication » 4.2 communications, 3.2 communication, 4.1 communication
4.2 developpement » 4.2 development, de developpement, le developpement
risk population » risk populations, drive population, risk regulation
population wage » population age, population wide, population aged
developpement l » developpement il, developpement la, developpement de
wage rate » wage rates
l afrique » en afrique
rate 4.2 » rates 4.2, rate 4.3, rate 5.2

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

• Adding a wildcard symbol may retrieve word variants: technology risk population wage rate 4.2 communication costs 4.2 developpement l afrique.*.