Perhaps you should try some spelling variations:
"psychologique" » "psychologie", "psychological"
"psychologiques" » "psychologies", "psychologicals", "psychologisches", "psychologie"
"psychologists" » "psychological", "psychologie"

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: (("psychologique" OR ("psychologists" OR "psychologiques")) OR "psychologische").
• Removing quotes may allow a broader search: (( psychologique or ( psychologists or psychologiques )) or psychologische ).
• Adding a wildcard symbol may retrieve word variants: (("psychologique" or ("psychologists" or "psychologiques")) or "psychologische")*.