Perhaps you should try some spelling variations:
"function systems a tools" » "equation systems a tools", "fusion system a tools", "pension systems a tools", "function systems _ tools", "function system a tools", "function systems via tools", "function systems a tool"
"function space using tools" » "function spaces using tools"
"function spaces a tools" » "function spaces _ tools", "function spaces fp tools", "function spaces hs tools", "function spaces a tool"

Try widening your search to All Fields.

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

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