Perhaps you should try some spelling variations:
petroiv » peteroiv (Expand Search), petruoiv (Expand Search), petrooiv (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruuuui » peteruuuui (Expand Search), petruuuuui (Expand Search), petrouuuui (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (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 (petroiv OR petriiv)) OR petruv) OR ((petri OR petruuuui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((peterov OR (petroiv OR petriiv)) OR petruv) OR ((petri OR petruuuui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((peterov OR (petroiv OR petriiv)) OR petruv) OR ((petri OR petruuuui) OR petr)) o.s.*.