Perhaps you should try some spelling variations:
"grounded theory6" » "grounded theorie", "grounded theory8.1", "grounded theories"
"bounded theory" » "bounds theory", "bounded theories", "boundary theory"
"blended theory" » "extended theory", "blending theory", "blended query"

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 ((((("bounded theory") OR ("grounded theory6"))) OR ("blended theory")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"grounded theory\") or (((((\"bounded theory\") OR (\"grounded theory6\"))) or (\"blended theory\"))))".
• Removing quotes may allow a broader search: (( grounded theory ) or ((((( bounded theory ) OR ( grounded theory6 ))) or ( blended theory )))).
• Adding a wildcard symbol may retrieve word variants: (("grounded theory") or ((((("bounded theory") OR ("grounded theory6"))) or ("blended theory"))))*.