Perhaps you should try some spelling variations:
"sierra jonas civil war" » "sieurs jonas civil war", "sierra jose civil war", "herr jonas civil war", "sierra donbas civil war"
"sierra leona civil war" » "sierra leone civil war", "sierra leone's civil war"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sierra jonas civil war\") OR (\"sierra leona civil war\"))".
• Removing quotes may allow a broader search: (( sierra jonas civil war ) OR ( sierra leona civil war )).
• Adding a wildcard symbol may retrieve word variants: (("sierra jonas civil war") OR ("sierra leona civil war"))*.