Perhaps you should try some spelling variations:
"acta slavica estonian" » "acta latvia estonia", "acta place estonian", "anna slavina estonian", "art slavic estonian", "et slavica estonian"
"acta latvian estonian" » "acta latvia estonia", "acta latvian social", "toth latvian estonian"
"suna latvian estonian" » "suna latvia estonia", "suna latvian social", "songs latvian estonian", "using latvian estonian"

Try widening your search to All Fields.

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