Perhaps you should try some spelling variations:
"Inperio handia, nazio txikiak" » "Inperio gandia, nazio txikiak" (Expand Search), "Inperio handia, nahio txikiak" (Expand Search)
"Inperio handia, nazi txikiak" » "Inperio gandia, nazi txikiak" (Expand Search), "Inperio handia, nahi txikiak" (Expand Search)
"inperio handia, nacio txikiak" » "inperio gandia, nacio txikiak" (Expand Search), "inperio handia, nacion txikiak" (Expand Search), "inperio handia, vacio txikiak" (Expand Search), "inperio handia, nacao txikiak" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("Inperio handia, nazio txikiak") OR ("Inperio handia, nazi txikiak"))) OR ("inperio handia, nacio txikiak"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Inperio handia, nazio txikiak\") OR (\"Inperio handia, nazi txikiak\"))) OR (\"inperio handia, nacio txikiak\"))".
• Removing quotes may allow a broader search: (((( Inperio handia, nazio txikiak ) OR ( Inperio handia, nazi txikiak ))) OR ( inperio handia, nacio txikiak )).
• Adding a wildcard symbol may retrieve word variants: (((("Inperio handia, nazio txikiak") OR ("Inperio handia, nazi txikiak"))) OR ("inperio handia, nacio txikiak"))*.