Perhaps you should try some spelling variations:
"acta slavica estonia" » "acta latvia estonia", "anna slavina estonia", "et slavica estonia"
"art slavic estonia" » "art latvia estonia", "art spain estonia", "east slavic estonia", "art static estonia", "balto slavic estonia"
"art slovenia estonia" » "area slovenia estonia", "park slovenia estonia", "after slovenia estonia"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("acta slavica estonia") OR ((("art slavic estonia") OR ("art slovenia estonia")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"acta slavica estonia\") or (((\"art slavic estonia\") OR (\"art slovenia estonia\"))))".
• Removing quotes may allow a broader search: (( acta slavica estonia ) or ((( art slavic estonia ) OR ( art slovenia estonia )))).
• Adding a wildcard symbol may retrieve word variants: (("acta slavica estonia") or ((("art slavic estonia") OR ("art slovenia estonia"))))*.