Perhaps you should try some spelling variations:
"bounded theory" » "blended theory", "bounds theory", "bounded theories"
"founded theory" » "grounded theory6", "founding theory", "coupled theory"
"grounded theory" » "ground 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: (((("grounded theory") OR ("founded theory"))) OR ("bounded theory")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"grounded theory\") OR (\"founded theory\"))) or (\"bounded theory\"))".
• Removing quotes may allow a broader search: (((( grounded theory ) OR ( founded theory ))) or ( bounded theory )).
• Adding a wildcard symbol may retrieve word variants: (((("grounded theory") OR ("founded theory"))) or ("bounded theory"))*.