Perhaps you should try some spelling variations:
petriiov » petrov (Expand Search), peteriiov (Expand Search), petriiiov (Expand Search), petruiiov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petriiuoov » peteriiuoov (Expand Search), petriiiuoov (Expand Search), petruiiuoov (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petruou (Expand Search)
petruiou » peteruiou (Expand Search), petriuiou (Expand Search), petruuiou (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 (((petruov OR petriiov) OR (petroov OR petriiuoov)) OR ((petrou OR petruiou) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petriiov) OR (petroov OR petriiuoov)) OR ((petrou OR petruiou) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR petriiov) OR (petroov OR petriiuoov)) OR ((petrou OR petruiou) OR petr)) o.s.*.