Perhaps you should try some spelling variations:
"function spaces fast tools" » "function systems fast tools"
"diffusion systems a tools" » "diffunction systemss a tools", "diffusion systems _ tools", "diffusion systems via tools", "diffusion system _ tools", "diffusion systems a tool"
"fusion system a tools" » "function systems a tools", "fusion system _ tools", "fusion systems _ tools", "fusion system a 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: (((("diffusion systems a tools") OR ("fusion system a tools"))) OR ("function spaces fast tools"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"diffusion systems a tools\") OR (\"fusion system a tools\"))) or (\"function spaces fast tools\"))~".
• Removing quotes may allow a broader search: (((( diffusion systems a tools ) OR ( fusion system a tools ))) or ( function spaces fast tools ))~.
• Adding a wildcard symbol may retrieve word variants: (((("diffusion systems a tools") OR ("fusion system a tools"))) or ("function spaces fast tools"))*.