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