Perhaps you should try some spelling variations:
2.2.5.7 communication » 2.2.5.4 communication, 2.2.3 communication, 2.3.1.1 communication
technology 6.3.1 » technology 3.1, technology 3.1.1, technology 3.2.1
developpement il » developpement de, developpement et, developpement du
6.3.1 inflation » 2.3.1 inflation, 3.3.3 inflation, 5.4.1 inflation
4 developpement » de developpement, le developpement, et developpement
prices 2.2.5.7 » prices 2.2.2, prices 2.3.5
il afrique » l afrique, en afrique
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 6.3.1 inflation _ prices 2.2.5.7 communication costs 4 developpement il afrique.*.