Perhaps you should try some spelling variations:
"motivational speaker" » "motivational speakers", "motivational states", "motivational sparc"
"motivational scale" » "motivational case", "motivational state", "motivational social"
"motivation scale" » "motivation state", "motivation scene", "motivation soziale"

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: (("motivational speaker") OR ((("motivational scale") OR ("motivation scale")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"motivational speaker\") or (((\"motivational scale\") OR (\"motivation scale\"))))".
• Removing quotes may allow a broader search: (( motivational speaker ) or ((( motivational scale ) OR ( motivation scale )))).
• Adding a wildcard symbol may retrieve word variants: (("motivational speaker") or ((("motivational scale") OR ("motivation scale"))))*.