Perhaps you should try some spelling variations:
2.3.4 communication » 12.2.4 communication, 12.4.4 communication, 2.3 communication
technology stress » technology sereis, technology address, technology surveys
stress reduction » risk reduction
developpement de » developpement des, developpement durable
a developpement » au developpement, de developpement, le developpement
reduction 12 » reduction 1, reduction 12.4, reduction 4.2
prices 2.3.4 » prices 2.3.1, prices 2.3.5, prices 2.3.6
de afrique » de l'afrique, en afrique, l afrique
12 prices » 2 prices, 2012 prices, 12 process
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology stress reduction 12 prices 2.3.4 communication costs a developpement de afrique.*.