Perhaps you should try some spelling variations:
petruoov » petrov (Expand Search), peteruoov (Expand Search), petriuoov (Expand Search), petrouoov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petrouiov (Expand Search)
petriiui » peteriiui (Expand Search), petriiiui (Expand Search), petroiiui (Expand Search)
petrou » peterou (Expand Search), petriou (Expand Search), petroou (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 ((petruoov OR (petruiov OR periov)) OR (((petriiui OR petrou) OR petru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruoov OR (petruiov OR periov)) OR (((petriiui OR petrou) OR petru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petruoov OR (petruiov OR periov)) OR (((petriiui OR petrou) OR petru) OR petr)) o.s.*.