Perhaps you should try some spelling variations:
"international rican economics series" » "international african economics series", "international rice economics series", "international american economics series", "international can economics series", "international african economies series"
"international energy economic series" » "international energy economics series", "international energy economy series", "international ecology economic series", "international energy economic services", "international energy economic theories"

Try widening your search to All Fields.

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

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