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

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 ("east slavic estonia")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"acta slavica estonia\") OR (\"art slavic estonia\"))) or (\"east slavic estonia\"))".
• Removing quotes may allow a broader search: (((( acta slavica estonia ) OR ( art slavic estonia ))) or ( east slavic estonia )).
• Adding a wildcard symbol may retrieve word variants: (((("acta slavica estonia") OR ("art slavic estonia"))) or ("east slavic estonia"))*.