Perhaps you should try some spelling variations:
diffusion systems » fusion system
function systems » equation systems, function spaces, fusion system
function system » fusion system
systems based » system based, systems fast, systems game
based two » based tool, based co
a tools » a tool, _ tools

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

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