Perhaps you should try some spelling variations:
"description general" » "description generale", "descripcion general", "description generation"
"description some" » "description sources", "description system", "description social"
"descriptive geometry" » "descriptions geometry"

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: (("descriptive geometry") OR ((("description general") OR ("description some")))).
• Removing quotes may allow a broader search: (( descriptive geometry ) or ((( description general ) or ( description some )))).
• Adding a wildcard symbol may retrieve word variants: (("descriptive geometry") or ((("description general") or ("description some"))))*.