Perhaps you should try some spelling variations:
"et slavica estonica" » "res slavica estonica"
"_ slavica estonica" » "_ slavish estonica", "_ slaving estonica", "_ slava estonica", "_ slavea estonica", "_ slavesa estonica", "_ slaina estonica"
"_ slavic estonica" » "_ slave estonica", "_ slaves estonica", "_ slain estonica"

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