Perhaps you should try some spelling variations:
"motivational states" » "motivational systems", "motivation state", "motivational system", "amotivational states", "motivation states", "motivational scales"
"motivational state" » "amotivational state", "motivation state", "motivational scale"
"motivation scale" » "motivational scale", "motivation state", "motivation scene"

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