Perhaps you should try some spelling variations:
"graphical reports / technique" » "graphical support / technique"
"graphical charts / technique" » "graphical chain / technique", "graphic arts / technique", "graphical data / technique"

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