Perhaps you should try some spelling variations:
"graphical processing unit." » "graphics processing unit.", "graphical processing units.", "graphical processing nlp."
"graphical processing _." » "graphics processing _.", "graphical process _."
"graphical processing a." » "graphics processing a.", "graphical processing nlp.", "graphical pressing _.", "graphical processing based."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("graphical processing unit.") or ("graphical processing _."))) or ("graphical processing a."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("graphical processing unit.") OR ("graphical processing _."))) OR ("graphical processing a.")).
• Removing quotes may allow a broader search: (((( graphical processing unit. ) or ( graphical processing _. ))) or ( graphical processing a. )).
• Adding a wildcard symbol may retrieve word variants: (((("graphical processing unit.") or ("graphical processing _."))) or ("graphical processing a."))*.