Perhaps you should try some spelling variations:
"international modern economy series" » "international modernity economy series", "international borders economy series", "international money economy series", "international modern economics series", "international modern economic series", "international open economy series"
"international poppy economy series" » "international policy economy series", "international ports economy series", "international power economy series", "international poppy 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 poppy economy series") OR ("international modern economy series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international poppy economy series\") OR (\"international modern economy series\"))".
• Removing quotes may allow a broader search: (( international poppy economy series ) OR ( international modern economy series )).
• Adding a wildcard symbol may retrieve word variants: (("international poppy economy series") OR ("international modern economy series"))*.