Perhaps you should try some spelling variations:
"acta slavica estonian" » "acta place estonian", "anna slavina estonian", "art slavic estonian"
"et slavica estonian" » "et place estonian", "res slavica estonian", "_ slavica estonian"
"acta latvian estonian" » "acta latvian social", "suna latvian estonian", "toth latvian estonian"
"et latvia estonia" » "_ latvia estonia", "et latina estonia", "1 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 estonian") OR ("et slavica estonian"))) OR ("acta latvian estonian"))) OR ("et latvia estonia")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"acta slavica estonian\") OR (\"et slavica estonian\"))) or (\"acta latvian estonian\"))) or (\"et latvia estonia\"))".
• Removing quotes may allow a broader search: (((((( acta slavica estonian ) OR ( et slavica estonian ))) or ( acta latvian estonian ))) or ( et latvia estonia )).
• Adding a wildcard symbol may retrieve word variants: (((((("acta slavica estonian") OR ("et slavica estonian"))) or ("acta latvian estonian"))) or ("et latvia estonia"))*.