Perhaps you should try some spelling variations:
volume ventilation » volume estimation, volume variation
technology volume » technologies volume, seismology volume, technology evolution
3.2 communication » 3 communication, 2.3 communication, de communication
ventilation rate » ventilation strategy, ventilation system, ventilation modes
et developpement » de developpement, le developpement, test development
developpement en » developpement et, developpement des, developpement de
rate case » state case, write case, rate caps
case 3.2 » case 4.2, case 3.1, case 5.2
costs et » costs _, costs 4, costs a

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 case 3.2 communication costs et developpement en afrique.*.