Perhaps you should try some spelling variations:
"international power economy series" » "international poverty economy series", "international panel economy series", "international project economy series", "international power economic series", "international poor economy series", "international war economy series"
"international ports economics series" » "international airports economics series", "international poverty economics series", "international efforts economics series", "international port economics series", "international sports economic series", "international arts economic 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 power economy series") or ("international ports economics series"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international power economy series") OR ("international ports economics series")).
• Removing quotes may allow a broader search: (( international power economy series ) or ( international ports economics series )).
• Adding a wildcard symbol may retrieve word variants: (("international power economy series") or ("international ports economics series"))*.