Perhaps you should try some spelling variations:
"ground theory" » "grounded theory", "group theory", "sound theory"
"groups theory" » "group theory"
"grand theory" » "graph theory", "band theory", "grand theories"
"groups other" » "groups over"

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: (((("ground theory") OR ("grand theory"))) OR ((("groups theory") OR ("groups other")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ground theory\") OR (\"grand theory\"))) or (((\"groups theory\") or (\"groups other\"))))".
• Removing quotes may allow a broader search: (((( ground theory ) OR ( grand theory ))) or ((( groups theory ) or ( groups other )))).
• Adding a wildcard symbol may retrieve word variants: (((("ground theory") OR ("grand theory"))) or ((("groups theory") or ("groups other"))))*.