Perhaps you should try some spelling variations:
"eastern european sources." » "east european sources.", "western europe sources.", "eastern european studies.", "eastern european southern.", "eastern european journal."
"eastern european series." » "east european series.", "western europe series.", "eastern european studies.", "eastern european cities.", "eastern european society."
"eastern europe series." » "eastern europe fisheries.", "eastern europe sources.", "eastern europe serving."

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