Perhaps you should try some spelling variations:
"runge theorie" » "range theories", "runge theory"
"d'une theorie" » "eine theorie", "d'un theoreme", "seine theorie"
"range theory" » "change theory", "gauge theory", "hodge theory"

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: (((("runge theorie") OR ("d'une theorie"))) OR ("range theory")).
• Removing quotes may allow a broader search: (((( runge theorie ) or ( d'une theorie ))) or ( range theory )).
• Adding a wildcard symbol may retrieve word variants: (((("runge theorie") or ("d'une theorie"))) or ("range theory"))*.