Perhaps you should try some spelling variations:
"blending theory" » "bending theory", "binding theory", "breeding theory"
"founded theory" » "grounded theory", "grounded theory6", "founding theory"
"bounds theory" » "bands theory", "funds theory", "brands 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: (("founded theory") OR ((("bounds theory") OR ("blending theory")))).
• Removing quotes may allow a broader search: (( founded theory ) or ((( bounds theory ) or ( blending theory )))).
• Adding a wildcard symbol may retrieve word variants: (("founded theory") or ((("bounds theory") or ("blending theory"))))*.