Perhaps you should try some spelling variations:
"pedagogical psychology" » "pedagogic psychology", "pedagogical psychological", "pedagogical ecology"
"ecological psychology" » "biological psychology", "ecological physiology", "clinical psychology"
"pedagogy psychology" » "pedagogic psychology", "pedagogy technology", "pediatric psychology"

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