Perhaps you should try some spelling variations:
petruov » petrov (Expand Search), peteruov (Expand Search), petruuov (Expand Search), petrouov (Expand Search)
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruuiuov » peteruuiuov (Expand Search), petruuuiuov (Expand Search), petrouuiuov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petriio » peteriio (Expand Search), petruiio (Expand Search), petroiio (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 ((((petruov OR petriov) OR (petruuiuov OR petruuiuov)) OR petr) OR (petriio OR petri)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruov OR petriov) OR (petruuiuov OR petruuiuov)) OR petr) OR (petriio OR petri)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petruov OR petriov) OR (petruuiuov OR petruuiuov)) OR petr) OR (petriio OR petri)) o.s.*.