Perhaps you should try some spelling variations:
volumetric smoke » volumetric shape, volumetric scene, volumetric bone
volumetric image » volumetric data
world gases » world games, world cases, world causes
ict world » iot world, int world, gift world
2008 ict » 2008 iet, 2008 ice, 2008 iso
tests* » texts*
test* » text*

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

• If you are trying to use Boolean operators, they must be ALL CAPS: 2008 ict world gases ((volumetric smoke) OR (volumetric image)) (tests* OR test*).
• The words AND, OR and NOT may confuse the search; try adding quotes: "2008 ict world gases ((volumetric smoke) OR (volumetric image)) (tests* or test*)".
• Adding a wildcard symbol may retrieve word variants: 2008 ict world gases ((volumetric smoke) OR (volumetric image)) (tests* or test*)*.