Perhaps you should try some spelling variations:
4.1 communication » 4 communication, 2.3 communication, 3.2 communication
developpement de » developpement des, developpement durable
dis integration » disintegration _
4 developpement » de developpement, le developpement, et developpement
technology dis » technology does, technology 4ir, technology dlt
integration 2 » integration 3, integration 4, integration 3.2
de afrique » de l'afrique, en afrique, l afrique
trade 4.1 » trade 2.2, trade 3.2
2 trade » 1 trade, 4 trade
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 dis integration 2 trade 4.1 communication costs 4 developpement de afrique.*.