Perhaps you should try some spelling variations:
"continuous theory" » "continuous tone", "continuous tensor"
"continue theory" » "continued theory", "continuity theory", "continues theorie"
"continuum theory" » "continued theory", "continues 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: (((("continue theory") OR ("continuous theory"))) OR ("continuum theory")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"continue theory\") OR (\"continuous theory\"))) or (\"continuum theory\"))".
• Removing quotes may allow a broader search: (((( continue theory ) OR ( continuous theory ))) or ( continuum theory )).
• Adding a wildcard symbol may retrieve word variants: (((("continue theory") OR ("continuous theory"))) or ("continuum theory"))*.