Perhaps you should try some spelling variations:
peterov » petrov (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (Expand Search)
petruiiv » peteruiiv (Expand Search), petruuiiv (Expand Search), petrouiiv (Expand Search)
petruuv » peteruuv (Expand Search), petruuuv (Expand Search), petrouuv (Expand Search)
petrouio » peterouio (Expand Search), petruouio (Expand Search), petroouio (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (((peterov OR (petruiv OR petruiiv)) OR petruuv) OR (petrouio OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR (petruiv OR petruiiv)) OR petruuv) OR (petrouio OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peterov OR (petruiv OR petruiiv)) OR petruuv) OR (petrouio OR (petr OR petri))) o.s.*.