Perhaps you should try some spelling variations:
"acta latvian estonian" » "acta latvia estonia", "acta latvian social", "suna latvian estonian", "toth latvian estonian"
"et slavica estonian" » "et latvia estonia", "et place estonian", "res slavica estonian", "_ slavica 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 latvian estonian") OR ("et slavica estonian")).
• Removing quotes may allow a broader search: (( acta latvian estonian ) or ( et slavica estonian )).
• Adding a wildcard symbol may retrieve word variants: (("acta latvian estonian") or ("et slavica estonian"))*.