Perhaps you should try some spelling variations:
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
simulation state » simulation states, simulation stage, simulation system
technology gap » technology 1, technology 2.2, technology 3
gap simulation » ea simulation, fab simulation, crop simulation
state case » states case, states cases, state based
1 afrique » l afrique, en afrique, 1 enrique
case 6.2 » case 6.12, case f6.2, case 4.2
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 gap simulation state case 6.2 communication costs a development 1 afrique.*.