Perhaps you should try some spelling variations:
east prussia » coast russia, la prussia, toast russia
east frisia » east frisian, west frisiae, east eurasia
west russia » western russia
east russia » art russia, eastern russia

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: ((((((east prussia) OR (east frisia))) OR (west russia))) OR (east russia)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((east prussia) OR (east frisia))) or (west russia))) or (east russia))".
• Adding a wildcard symbol may retrieve word variants: ((((((east prussia) OR (east frisia))) or (west russia))) or (east russia))*.