Perhaps you should try some spelling variations:
"east european sources." » "east european studies.", "east european southern.", "east european journal.", "fast european sources."
"eastern european series." » "eastern europe series.", "eastern european studies.", "eastern european cities.", "eastern european society.", "fastern european series."
"western europe sources." » "eastern 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: (((("east european sources.") or ("western europe sources."))) or ("eastern european series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("east european sources.") OR ("western europe sources."))) OR ("eastern european series.")).
• Removing quotes may allow a broader search: (((( east european sources. ) or ( western europe sources. ))) or ( eastern european series. )).
• Adding a wildcard symbol may retrieve word variants: (((("east european sources.") or ("western europe sources."))) or ("eastern european series."))*.