Perhaps you should try some spelling variations:
2.1 communication » 2.14 communication, 2.3 communication, 2.7 communication
inflation levels » inflation rates, education levels, pollution levels
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
levels prices » level price, cereals prices, metals prices
technology 3 » technology _, technology 1, technology 4
3 inflation » _ inflation, 2 inflation, 6 inflation
de fabrique » la fabrique, de l'afrique
prices 2.1 » prices 2.4, prices 2.3, prices 3.1
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 inflation levels prices 2.1 communication costs 4 developpement de fabrique.*.