Perhaps you should try some spelling variations:
6.4 communication » 5.4 communication, 1.4 communication, 2.4 communication
technology 3.3.1 » technology 3.1.1, technology 3.2.1, technology 6.3.1
developpement du » developpement de, developpement des, developpement et
3.3.1 inflation » 2.3.1 inflation, 3.3.3 inflation, 5.4.1 inflation
4 developpement » de developpement, le developpement, et developpement
inflation age » inflation rate, inflation a, inflation auf
du afrique » en afrique, l afrique, de l'afrique
age race » wages race, age range, cane race
race 6.4 » race 1.4, grace 6.2, races 6.3
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology 3.3.1 inflation age race 6.4 communication costs 4 developpement du afrique.*.