Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petrv » petrov (Expand Search), petru (Expand Search), petro (Expand Search), peterv (Expand Search), petruv (Expand Search)
petrua » petru (Expand Search), petra (Expand Search), peterua (Expand Search), petruua (Expand Search), petroua (Expand Search)
petris » peteris (Expand Search), petruis (Expand Search), petrois (Expand Search)
petruiv » peteruiv (Expand Search), petruuiv (Expand Search), petrouiv (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 ((petroov OR ((petrv OR petrua) OR (petris OR petruiv))) OR (peteruo OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR ((petrv OR petrua) OR (petris OR petruiv))) OR (peteruo OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR ((petrv OR petrua) OR (petris OR petruiv))) OR (peteruo OR (petr OR petri))) o.s.*.