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