Perhaps you should try some spelling variations:
"economic perceptions" » "economics perception", "economic conceptions", "economic exception"
"economic depression" » "economic recession", "economic depreciation", "economic deprivation"
"economic reception" » "economic recession", "economic exception", "economics perception"

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