Perhaps you should try some spelling variations:
"international africa's economy series" » "international agencies economy series", "international price economy series", "international airports economy series", "international africa's economic series", "international african economy series", "international africa economic series"
"international prices autonomy series" » "international best autonomy series", "international banks autonomy series", "international provider autonomy 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 prices autonomy series") OR ("international africa's economy series"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international prices autonomy series\") OR (\"international africa's economy series\"))".
• Removing quotes may allow a broader search: (( international prices autonomy series ) OR ( international africa's economy series )).
• Adding a wildcard symbol may retrieve word variants: (("international prices autonomy series") OR ("international africa's economy series"))*.