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"
"acta place estonia" » "acta place estonian", "acta police estonia", "acta policy estonia", "area place estonia", "data place estonia"
"action place estonia" » "action place estonian", "action police estonia", "action policy estonia", "action plane estonia", "action's place estonia", "action plan 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 ((("acta place estonia") OR ("action place estonia")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"acta slavica estonian\") or (((\"acta place estonia\") OR (\"action place estonia\"))))".
• Removing quotes may allow a broader search: (( acta slavica estonian ) or ((( acta place estonia ) OR ( action place estonia )))).
• Adding a wildcard symbol may retrieve word variants: (("acta slavica estonian") or ((("acta place estonia") OR ("action place estonia"))))*.