Perhaps you should try some spelling variations:
international american » international african, international africa, international empirical
international friction » international aviation, international action, international edition
american economy » american economic, african economic, agrarian economy
friction economy » fiction economy, aviation economy, production economy
economy series » 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 american economy series ) or ( international friction economy series ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( international american economy series ) OR ( international friction economy series )).
• Adding a wildcard symbol may retrieve word variants: (( international american economy series ) or ( international friction economy series ))*.