Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
volume ventilation » volume estimation, volume variation
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
seismology volume » technology volume
ventilation rate » ventilation strategy, ventilation system, ventilation modes
developpement du » developpement de, developpement des, developpement et
a developpement » au developpement, de developpement, le developpement
du afrique » en afrique, l afrique, de l'afrique
rate date » rate data, trade date, rate water
date 3.1 » daten 3.1, data 3.1, debate 3.1
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: seismology volume ventilation rate date 3.1 communications costs a developpement du afrique.*.