Perhaps you should try some spelling variations:
perov » petrov (Expand Search)
petroiov » petrov (Expand Search), peteroiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search)
petroov » peteroov (Expand Search), petruoov (Expand Search), petrooov (Expand Search)
petriuv » peteriuv (Expand Search), petruiuv (Expand Search), petroiuv (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petriu » peteriu (Expand Search), petruiu (Expand Search), petroiu (Expand Search)
petr » peter (Expand Search), petru (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 ((((petroov OR perov) OR petroiov) OR petriuv) OR (((petero OR petri) OR petriu) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petroov OR perov) OR petroiov) OR petriuv) OR (((petero OR petri) OR petriu) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petroov OR perov) OR petroiov) OR petriuv) OR (((petero OR petri) OR petriu) OR petr)) o.s.*.