Perhaps you should try some spelling variations:
petrouov » petrov (Expand Search), peterouov (Expand Search), petroouov (Expand Search), perouov (Expand Search)
perv » per (Expand Search)
petriv » peteriv (Expand Search), petroiv (Expand Search), periv (Expand Search)
petrv » peterv (Expand Search), petrov (Expand Search), perv (Expand Search)
petru » peteru (Expand Search), petrou (Expand Search), peru (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search), peri (Expand Search)
petr » peter (Expand Search), petro (Expand Search), per (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 ((((petrouov OR peterov) OR petriv) OR (petrv OR perv)) OR ((petru OR petri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrouov OR peterov) OR petriv) OR (petrv OR perv)) OR ((petru OR petri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrouov OR peterov) OR petriv) OR (petrv OR perv)) OR ((petru OR petri) OR petr)) o.s.*.