Perhaps you should try some spelling variations:
petruuov » petrov (Expand Search), peteruuov (Expand Search), petriuuov (Expand Search), petruuuov (Expand Search)
petruiov » petrov (Expand Search), peteruiov (Expand Search), petriuiov (Expand Search), petruuiov (Expand Search)
perov » petrov (Expand Search)
peru » petru (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petriou » peteriou (Expand Search), petriiou (Expand Search), petruiou (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 petruuov) OR (petruiov OR perov)) OR (((per OR petriou) OR peru) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petruuov) OR (petruiov OR perov)) OR (((per OR petriou) OR peru) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR petruuov) OR (petruiov OR perov)) OR (((per OR petriou) OR peru) OR petr)) o.s.*.