Perhaps you should try some spelling variations:
"bounded variables" » "bounded variable"
"bound variables" » "und variablen", "und variable"
"bind variables" » "binary variables", "field variables", "mixed variables"

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: (("bounded variation") OR ((("bounded variables") OR ((("bind variables") OR ("bound variables")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"bounded variation\") or (((\"bounded variables\") or (((\"bind variables\") OR (\"bound variables\"))))))".
• Removing quotes may allow a broader search: (( bounded variation ) or ((( bounded variables ) or ((( bind variables ) OR ( bound variables )))))).
• Adding a wildcard symbol may retrieve word variants: (("bounded variation") or ((("bounded variables") or ((("bind variables") OR ("bound variables"))))))*.