Perhaps you should try some spelling variations:
2.1 communication » 2.14 communication, 2.3 communication, 2.7 communication
technology rapid » technology rate, technology road, technology trap
rapid population » world population
4 developpement » de developpement, le developpement, et developpement
developpement 3 » developpement de, developpement et, developpement du
population das » population data, population case, population de
3 materials » 2 materials
das prices » gas prices, gas price, do prices
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 rapid population das prices 2.1 communication costs 4 developpement 3 materials.*.