Perhaps you should try some spelling variations:
"graphical design / technique" » "graphic design / technique", "graphics design / technique", "graphs design / technique"
"graphical chain / technique" » "graphical charts / technique"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"graphical chain / technique\") OR (\"graphical design / technique\"))".
• Removing quotes may allow a broader search: (( graphical chain / technique ) OR ( graphical design / technique )).
• Adding a wildcard symbol may retrieve word variants: (("graphical chain / technique") OR ("graphical design / technique"))*.