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

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