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"
"yet large estonian" » "jet large estonian", "set large estonian", "yeast large estonian", "yjet large estonian", "yset large estonian", "ytext large estonian"
"et large estonian" » "jet large estonian", "set large estonian", "text large 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 ((("et large estonian") OR ("yet large estonian")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"acta slavica estonian\") or (((\"et large estonian\") OR (\"yet large estonian\"))))".
• Removing quotes may allow a broader search: (( acta slavica estonian ) or ((( et large estonian ) OR ( yet large estonian )))).
• Adding a wildcard symbol may retrieve word variants: (("acta slavica estonian") or ((("et large estonian") OR ("yet large estonian"))))*.