Perhaps you should try some spelling variations:
"radial singular" » "maximal singular", "adic singular", "real singular"
"radial angular" » "spatial angular", "radiation angular", "critical angular"
"radial angle" » "axial angle", "carpal angle", "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 angular") OR ("radial singular")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"radial angle\") or (((\"radial angular\") OR (\"radial singular\"))))".
• Removing quotes may allow a broader search: (( radial angle ) or ((( radial angular ) OR ( radial singular )))).
• Adding a wildcard symbol may retrieve word variants: (("radial angle") or ((("radial angular") OR ("radial singular"))))*.