Perhaps you should try some spelling variations:
"10 step theories" » "10 deep theories", "10 system theories", "10 nested theories"
"10 steps series" » "10 step series", "10 steps stages"
"10 steps seem" » "10 steps step", "10 steps set", "10 steps system"

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: (((("10 steps series") OR ("10 step theories"))) OR ("10 steps seem")).
• Removing quotes may allow a broader search: (((( 10 steps series ) or ( 10 step theories ))) or ( 10 steps seem )).
• Adding a wildcard symbol may retrieve word variants: (((("10 steps series") or ("10 step theories"))) or ("10 steps seem"))*.