Perhaps you should try some spelling variations:
"international planned economies trade" » "international panel economies trade", "international plant economies trade", "international land economies trade", "international advanced economies trade", "international planned economy trade"
"international open economies trade" » "international hope economies trade", "international order economies trade", "international scope economies trade", "international open economy trade"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("international open economies trade") or ("international planned economies trade"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international open economies trade") OR ("international planned economies trade")).
• Removing quotes may allow a broader search: (( international open economies trade ) or ( international planned economies trade )).
• Adding a wildcard symbol may retrieve word variants: (("international open economies trade") or ("international planned economies trade"))*.