Perhaps you should try some spelling variations:
"international economics ecological status" » "international economics ecologically status", "international economics technological status", "international economics sociological status", "international economics ecological systems", "international economics ecological studies", "international economics ecological system"
"international policy economic theories" » "international poverty economic theories", "international prices economic theories", "national policy economic theories", "international policy economic theory", "international policy economics series"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international economics ecological status") or ("international policy economic theories"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international economics ecological status") OR ("international policy economic theories"))*.
• Removing quotes may allow a broader search: (( international economics ecological status ) or ( international policy economic theories ))*.