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