Perhaps you should try some spelling variations:
"east european southern." » "east europe southern.", "east europe northern.", "fast european southern."
"eastern european sources." » "western europe sources.", "eastern european studies.", "eastern european series.", "eastern european journal.", "fastern european sources."
"eastern europe sources." » "fastern europe sources."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("eastern european sources.") OR ("eastern europe sources."))) or ("east european southern."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("eastern european sources.") OR ("eastern europe sources."))) OR ("east european southern.")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"eastern european sources.\") OR (\"eastern europe sources.\"))) or (\"east european southern.\"))".
• Removing quotes may allow a broader search: (((( eastern european sources. ) OR ( eastern europe sources. ))) or ( east european southern. )).
• Adding a wildcard symbol may retrieve word variants: (((("eastern european sources.") OR ("eastern europe sources."))) or ("east european southern."))*.