Perhaps you should try some spelling variations:
"sierra jonas civil war" » "sieurs jonas civil war", "sierra leona civil war", "herr jonas civil war", "sierra donbas civil war"
"sierra jose civil war" » "sierra leone civil war", "sierra house civil war", "sierra code civil war", "sierra more 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 jose civil war\"))".
• Removing quotes may allow a broader search: (( sierra jonas civil war ) OR ( sierra jose civil war )).
• Adding a wildcard symbol may retrieve word variants: (("sierra jonas civil war") OR ("sierra jose civil war"))*.