Perhaps you should try some spelling variations:
african countries » rich countries
across countries » cross country
asian countries » union countries, riparian countries, client countries
arab countries » market countries
host countries » poor countries, host country

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( europe's asian countries. ) or ((( europe's ((arab countries) or (african countries)). ) or ( europe's ((across countries) OR (host countries)). ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( europe's asian countries. ) OR ((( europe's ((arab countries) OR (african countries)). ) OR ( europe's ((across countries) OR (host countries)). )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( europe's asian countries. ) or ((( europe's ((arab countries) or (african countries)). ) or ( europe's ((across countries) OR (host countries)). ))))".
• Adding a wildcard symbol may retrieve word variants: (( europe's asian countries. ) or ((( europe's ((arab countries) or (african countries)). ) or ( europe's ((across countries) OR (host countries)). ))))*.