Perhaps you should try some spelling variations:
petroov » petrov (Expand Search), peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
peters » peter (Expand Search), petersen (Expand Search)
petruou » peteruou (Expand Search), petruuou (Expand Search), petrouou (Expand Search)
petrouou » peterouou (Expand Search), petruouou (Expand Search), petroouou (Expand Search)
petruiou » peteruiou (Expand Search), petruuiou (Expand Search), petrouiou (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 (((peters OR (petruou OR petrouou)) OR petruiou) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petroov OR (((peters OR (petruou OR petrouou)) OR petruiou) OR (petr OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (petroov OR (((peters OR (petruou OR petrouou)) OR petruiou) OR (petr OR petri))) o.s.*.