Perhaps you should try some spelling variations:
"acta slavica estonia" » "anna slavina estonia", "et slavica estonia"
"art slovenia estonia" » "area slovenia estonia", "park slovenia estonia", "after slovenia estonia"
"acta latvia estonia" » "haiti latvia estonia"
"art slavic estonia" » "east slavic estonia", "art static estonia", "balto slavic 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 ("acta latvia 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 (\"acta latvia estonia\"))) or (((\"art slavic estonia\") or (\"art slovenia estonia\"))))".
• Removing quotes may allow a broader search: (((( acta slavica estonia ) OR ( acta latvia estonia ))) or ((( art slavic estonia ) or ( art slovenia estonia )))).
• Adding a wildcard symbol may retrieve word variants: (((("acta slavica estonia") OR ("acta latvia estonia"))) or ((("art slavic estonia") or ("art slovenia estonia"))))*.