Perhaps you should try some spelling variations:
function systems » equation systems, function spaces, fusion system
systems based » system based, systems fast, systems game
spaces using » space using, gases using, parts using
based tools » based tool, coated tools
paper using » layer using, sampler using, cancer using

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

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