Perhaps you should try some spelling variations:
volumetric metal » volumetric meta, volumetric real, volumetric medical
gas volumetric » gases volumetric, a volumetric, based volumetric
metal threats » metal threads, lethal threats, retail threats
iet world » iot world, net world, ict world
world gas » world gis, world gps, world games
2008 iet » 2008 ieee