Perhaps you should try some spelling variations:
petrouuv » petrov (Expand Search), peterouuv (Expand Search), petruouuv (Expand Search), petroouuv (Expand Search)
petroiuv » petrov (Expand Search), peteroiuv (Expand Search), petruoiuv (Expand Search), petrooiuv (Expand Search)
petriuuv » peteriuuv (Expand Search), petruiuuv (Expand Search), petroiuuv (Expand Search)
petruo » peteruo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 ((((petrouuv OR peruuv) OR petriuuv) OR petroiuv) OR ((petruo OR (petri OR per)) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petrouuv OR peruuv) OR petriuuv) OR petroiuv) OR ((petruo OR (petri OR per)) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((((petrouuv OR peruuv) OR petriuuv) OR petroiuv) OR ((petruo OR (petri OR per)) OR petr)) o.s.*.