Perhaps you should try some spelling variations:
"acta slavica estonia" » "acta slovenia estonia", "anna slavina estonia", "art slavic estonia"
"et slavica estonia" » "et slovenia estonia", "res slavica estonia", "_ slavica estonia"
"east slavic estonia" » "east spain estonia", "east slovenia estonia", "balto slavic estonia"
"acta latvia estonia" » "haiti latvia 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 ("et slavica estonia"))) OR ("acta latvia estonia"))) OR ("east slavic estonia")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"acta slavica estonia\") OR (\"et slavica estonia\"))) or (\"acta latvia estonia\"))) or (\"east slavic estonia\"))".
• Removing quotes may allow a broader search: (((((( acta slavica estonia ) OR ( et slavica estonia ))) or ( acta latvia estonia ))) or ( east slavic estonia )).
• Adding a wildcard symbol may retrieve word variants: (((((("acta slavica estonia") OR ("et slavica estonia"))) or ("acta latvia estonia"))) or ("east slavic estonia"))*.