Perhaps you should try some spelling variations:
6.1.1 communication » 6.1.3 communication, 3.4.1 communication, 4.1.7 communication
seismology volume » technology volume
volume variation » volume evaluation, volume ventilation, volume estimation
developpement la » developpement de, developpement et, developpement du
variation de » variation des, variation der, variation due
care 6.1.1 » care 1.1.1, care 5.1.1, care 6.4.1.1
la afrique » l afrique, la fabrique, en afrique
de care » due care, we care, de cane

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

• Adding a wildcard symbol may retrieve word variants: seismology volume variation de care 6.1.1 communication costs _ developpement la afrique.*.