Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
4.2 developpement » 4.2 development, de developpement, le developpement
developpement de » developpement des, developpement durable
technology 3 » technology _, technology 1, technology 4
problems 6.2 » problems 2.2, problems 3.2, problems 6.1
3 regional » 4 regional, 2 regional
de afrique » de l'afrique, en afrique, l afrique

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

• Adding a wildcard symbol may retrieve word variants: technology 3 regional urban problems 6.2 communication costs 4.2 developpement de afrique.*.