Perhaps you should try some spelling variations:
"bounded theory" » "grounded theory", "blended theory", "bounds theory"
"founded theory" » "grounded theory", "grounded theory6", "founding theory"
"coupled theory" » "coupling theory", "coupled thermo", "coupled memory"

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: (("bounded theory") OR ((("founded theory") OR ("coupled theory")))).
• Removing quotes may allow a broader search: (( bounded theory ) or ((( founded theory ) or ( coupled theory )))).
• Adding a wildcard symbol may retrieve word variants: (("bounded theory") or ((("founded theory") or ("coupled theory"))))*.