Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruiou » peteruiou (Expand Search), petriuiou (Expand Search), petruuiou (Expand Search)
petriiou » peteriiou (Expand Search), petriiiou (Expand Search), petruiiou (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 peteriuov) OR petruuov) OR petriuv) OR ((petruiou OR petriiou) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR peteriuov) OR petruuov) OR petriuv) OR ((petruiou OR petriiou) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR peteriuov) OR petruuov) OR petriuv) OR ((petruiou OR petriiou) OR petr)) o.s.*.