Perhaps you should try some spelling variations:
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petruis » peteruis (Expand Search), petruuis (Expand Search), petrouis (Expand Search)
petruiuo » peteruiuo (Expand Search), petruuiuo (Expand Search), petrouiuo (Expand Search)
petrouuo » peterouuo (Expand Search), petruouuo (Expand Search), petroouuo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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: fop (((petruuv OR petr) OR (petris OR petruis)) OR ((petruiuo OR petrouuo) OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruuv OR petr) OR (petris OR petruis)) OR ((petruiuo OR petrouuo) OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruuv OR petr) OR (petris OR petruis)) OR ((petruiuo OR petrouuo) OR petri)) o.s.*.