Perhaps you should try some spelling variations:
diffunction system » diffusion systems
function systems » equation systems, function spaces, fusion system
systems using » system using, symptoms using, systems usage
coated tools » coated tio2, copper tools
based tools » based tool

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: (( diffunction system ((based tools) OR (coated tools)) ) OR ( function systems using tools ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( diffunction system ((based tools) OR (coated tools)) ) or ( function systems using tools ))~".
• Adding a wildcard symbol may retrieve word variants: (( diffunction system ((based tools) OR (coated tools)) ) or ( function systems using tools ))*.