Perhaps you should try some spelling variations:
"acta slavica estonian" » "acta latvia estonia", "anna slavina estonian", "art slavic estonian"
"et slavica estonian" » "et latvia estonia", "res slavica estonian", "_ slavica estonian"
"et latvian estonian" » "et latvia estonia", "et latvian social", "_ latvian estonian", "10 latvian estonian", "7 latvian estonian"
"acta place estonian" » "acta place estonia", "acta large estonian", "acta elite estonian", "area place estonian", "data place estonian", "action place 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 ("acta place estonian"))) OR ((("et slavica estonian") OR ("et latvian estonian")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"acta slavica estonian\") OR (\"acta place estonian\"))) or (((\"et slavica estonian\") or (\"et latvian estonian\"))))".
• Removing quotes may allow a broader search: (((( acta slavica estonian ) OR ( acta place estonian ))) or ((( et slavica estonian ) or ( et latvian estonian )))).
• Adding a wildcard symbol may retrieve word variants: (((("acta slavica estonian") OR ("acta place estonian"))) or ((("et slavica estonian") or ("et latvian estonian"))))*.