Perhaps you should try some spelling variations:
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruiv » peteruiv (Expand Search), petriuiv (Expand Search), petruuiv (Expand Search)
petriuv » peteriuv (Expand Search), petriiuv (Expand Search), petruiuv (Expand Search)
petruiuv » peteruiuv (Expand Search), petriuiuv (Expand Search), petruuiuv (Expand Search)
petriuiuv » peteriuiuv (Expand Search), petriiuiuv (Expand Search), petruiuiuv (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 petruiv) OR (petriuv OR (petruiuv OR petriuiuv))) OR petr) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (((petruov OR petruiv) OR (petriuv OR (petruiuv OR petriuiuv))) OR petr) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop (((petruov OR petruiv) OR (petriuv OR (petruiuv OR petriuiuv))) OR petr) o.s.*.