Perhaps you should try some spelling variations:
"bounded variables" » "und variables", "based variables"
"bounded variable" » "und variable", "based 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 ((("bounded variable") OR ("bound variables"))))) OR ("bind variables")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"bounded variation\") or (((((\"bounded variables\") or (((\"bounded variable\") OR (\"bound variables\"))))) or (\"bind variables\"))))".
• Removing quotes may allow a broader search: (( bounded variation ) or ((((( bounded variables ) or ((( bounded variable ) OR ( bound variables ))))) or ( bind variables )))).
• Adding a wildcard symbol may retrieve word variants: (("bounded variation") or ((((("bounded variables") or ((("bounded variable") OR ("bound variables"))))) or ("bind variables"))))*.