Perhaps you should try some spelling variations:
"western european sources." » "eastern european sources.", "eastern europe sources.", "western european studies.", "western european series.", "western european southern."
"western auroral studies." » "western array studies.", "western moral studies.", "western australia studies.", "western rural studies.", "western factorial studies.", "western cultural studies."
"western europe sources." » "eastern europe sources."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("western europe sources.") or ("western european sources."))) or ("western auroral studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("western europe sources.") OR ("western european sources."))) OR ("western auroral studies.")).
• Removing quotes may allow a broader search: (((( western europe sources. ) or ( western european sources. ))) or ( western auroral studies. )).
• Adding a wildcard symbol may retrieve word variants: (((("western europe sources.") or ("western european sources."))) or ("western auroral studies."))*.