Perhaps you should try some spelling variations:
"development psychological" » "development technological", "unemployment psychological", "environment psychological"
"development psychology" » "development physiology", "development technology", "development ecology"

Try widening your search to All Fields.

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