Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petriiv » peteriiv (Expand Search), petruiiv (Expand Search), petroiiv (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroou » peteroou (Expand Search), petruoou (Expand Search), petrooou (Expand Search)
petruoou » peteruoou (Expand Search), petruuoou (Expand Search), petrouoou (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 (petriiv OR ((petroov OR petroov) OR ((petr OR (petroou OR petruoou)) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriiv OR ((petroov OR petroov) OR ((petr OR (petroou OR petruoou)) OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petriiv OR ((petroov OR petroov) OR ((petr OR (petroou OR petruoou)) OR petri))) o.s.*.