Perhaps you should try some spelling variations:
"runge theorie" » "range theories"
"change theory" » "exchange theory", "gauge theory", "hodge theory"
"runge theory" » "regge theory", "nudge theory", "gauge theory"
"range theory" » "gauge theory", "hodge theory", "line 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 ((((("runge theory") OR ("change theory"))) OR ("range theory")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"runge theorie\") or (((((\"runge theory\") OR (\"change theory\"))) or (\"range theory\"))))".
• Removing quotes may allow a broader search: (( runge theorie ) or ((((( runge theory ) OR ( change theory ))) or ( range theory )))).
• Adding a wildcard symbol may retrieve word variants: (("runge theorie") or ((((("runge theory") OR ("change theory"))) or ("range theory"))))*.