Perhaps you should try some spelling variations:
function systems » equation systems, function spaces, fusion system
diffusion system » diffusion systems, 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( diffusion system ((based tools) OR (coated tools)) ) or ( function systems using tools ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( diffusion system ((based tools) OR (coated tools)) ) OR ( function systems using tools )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( diffusion system ((based tools) OR (coated tools)) ) or ( function systems using tools ))".
• Adding a wildcard symbol may retrieve word variants: (( diffusion system ((based tools) OR (coated tools)) ) or ( function systems using tools ))*.