Perhaps you should try some spelling variations:
peteruov » petrov (Expand Search)
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petruiuov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroi » peteroi (Expand Search), petrioi (Expand Search), petruoi (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((petriuv OR ((peteruov OR (peterov OR petruov)) OR petriuov)) OR (petroi OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuv OR ((peteruov OR (peterov OR petruov)) OR petriuov)) OR (petroi OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuv OR ((peteruov OR (peterov OR petruov)) OR petriuov)) OR (petroi OR petr)) o.s.*.