Perhaps you should try some spelling variations:
diffunction systems » diffusion systems, function systems
symptoms using » symptoms among
systems based » system based, systems fast, systems game
systems using » system using, systems usage
based tools » based tool, coated tools

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

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