Perhaps you should try some spelling variations:
peteri » peterdi (Expand Search), peter (Expand Search), peters (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petrui » peterui (Expand Search), petruui (Expand Search), petroui (Expand Search), petru (Expand Search)
petruov » peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search), petrov (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search), petru (Expand Search), petrov (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 ((petris OR peteri) OR ((petr OR (petri OR petrui)) OR ((petruov OR petruv) OR petris))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petris OR peteri) OR ((petr OR (petri OR petrui)) OR ((petruov OR petruv) OR petris))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petris OR peteri) OR ((petr OR (petri OR petrui)) OR ((petruov OR petruv) OR petris))) o.s.*.