Perhaps you should try some spelling variations:
"acta slavica estonian" » "acta latvia estonia", "acta latvian estonian", "acta place estonian", "anna slavina estonian", "art slavic estonian"
"et slavica estonian" » "et latvia estonia", "et latvian estonian", "et place estonian", "res slavica estonian"
"_ slavica estonian" » "_ latvia estonia", "_ latvian estonian", "_ place estonian", "_ slavic estonian", "_ slavish estonian", "_ slaving estonian"
"acta latvian social" » "acta latvia's social", "acta asian social", "acta adrian social", "suna latvian social", "toth latvian social"

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