Perhaps you should try some spelling variations:
"optical angle" » "optical angles", "optimal angle", "optical single"
"radial angle" » "radial angular", "carpal angle", "ostial angle"
"radial axis" » "radial basis", "radial axial", "medial axis"
"axial angle" » "axial age", "axial ranges", "ostial angle"

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: (((("radial angle") OR ("radial axis"))) OR ((("optical angle") OR ("axial angle")))).
• Removing quotes may allow a broader search: (((( radial angle ) or ( radial axis ))) or ((( optical angle ) or ( axial angle )))).
• Adding a wildcard symbol may retrieve word variants: (((("radial angle") or ("radial axis"))) or ((("optical angle") or ("axial angle"))))*.