Perhaps you should try some spelling variations:
volume ventilation » volume estimation, volume variation
technology volume » technologies volume, seismology volume, technology evolution
ventilation rate » ventilation strategy, ventilation system, ventilation modes
developpement du » developpement de, developpement des, developpement et
1 communication » 10 communication, 3 communication, 4 communication
4 developpement » de developpement, le developpement, et developpement
du afrique » en afrique, l afrique, de l'afrique
rate gan » rate can, rate band, rate cap
costs 4 » costs _, costs a, costs 4.2
gan 1 » gan _, ban 1, ga 1

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

• Adding a wildcard symbol may retrieve word variants: technology volume ventilation rate gan 1 communication costs 4 developpement du afrique.*.