Perhaps you should try some spelling variations:
"acta slavica estonian" » "acta latvia estonia", "acta place estonian", "anna slavina estonian"
"et slavica estonian" » "et latvia estonia", "et place estonian", "res slavica estonian", "_ slavica estonian"
"acta latvian estonian" » "acta latvia estonia", "acta latvian social", "suna latvian estonian", "toth latvian estonian"
"art slavic estonian" » "east slavic estonian", "art static estonian", "balto slavic estonian"

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