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 static estonia", "balto slavic estonia", "proto slavic estonia"
"east slavic estonia" » "east latvia estonia", "balto slavic estonia"
"east slovenia estonia" » "art slovenia estonia", "eastern slovenia estonia", "castle 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 ((("east slavic estonia") OR ("east slovenia 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\") OR (\"east slovenia estonia\"))))))".
• Removing quotes may allow a broader search: (( acta slavica estonia ) or ((( art slavic estonia ) or ((( east slavic estonia ) OR ( east slovenia estonia )))))).
• Adding a wildcard symbol may retrieve word variants: (("acta slavica estonia") or ((("art slavic estonia") or ((("east slavic estonia") OR ("east slovenia estonia"))))))*.