Perhaps you should try some spelling variations:
petroiov » petrov (Expand Search), peteroiov (Expand Search), petruoiov (Expand Search), petrooiov (Expand Search)
petruuoiv » peteruuoiv (Expand Search), petruuuoiv (Expand Search), petrouuoiv (Expand Search)
petruv » peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petrv » peterv (Expand Search), petruv (Expand Search), petrov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: fop ((((petruuoiv OR petroiov) OR petruv) OR (petrv OR peterv)) OR (petri OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((((petruuoiv OR petroiov) OR petruv) OR (petrv OR peterv)) OR (petri OR petr)) o.s.*".