Perhaps you should try some spelling variations:
trap interactions » group interactions, drug interactions, sea interactions
2.2 communication » 2.3 communication, 3.2 communication, 2.7 communication
technology trap » technology trade, technology tax, technology than
a developpement » au developpement, de developpement, le developpement
interactions a » interactions _, interactions 4, interactions among
problem 2.2 » problem 3.2, problem 2.1, problem 1.2
des afrique » en afrique, de l'afrique
a problem » das problem
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 trap interactions a problem 2.2 communication costs a developpement des afrique.*.