Perhaps you should try some spelling variations:
petriouv » petrov (Expand Search), peteriouv (Expand Search), petriiouv (Expand Search), petruiouv (Expand Search)
petroov » peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petruou » peteruou (Expand Search), petriuou (Expand Search), petruuou (Expand Search)
petroou » peteroou (Expand Search), petrioou (Expand Search), petruoou (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 ((petroov OR (petruv OR petriouv)) OR ((petruou OR (peterou OR petroou)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petroov OR (petruv OR petriouv)) OR ((petruou OR (peterou OR petroou)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petroov OR (petruv OR petriouv)) OR ((petruou OR (peterou OR petroou)) OR petr)) o.s.*.