Perhaps you should try some spelling variations:
volumetric radial » volumetric medical, volumetric cardiac, volumetric real
gas volumetric » gases volumetric, a volumetric, based volumetric
radial thrusts » radial thrust, axial thrust, radial bursts
iet world » iot world, net world, ict world
world gas » world gis, world gps, world games
2008 iet » 2008 ieee