Perhaps you should try some spelling variations:
petruv » petru (Expand Search), peteruv (Expand Search), petruuv (Expand Search), petrouv (Expand Search)
petero » peter (Expand Search), peters (Expand Search), petro (Expand Search)
peterov » peterv (Expand Search), petersv (Expand Search), petrov (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (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 (petruv OR ((petero OR (petrov OR peterov)) OR (petr OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petruv OR ((petero OR (petrov OR peterov)) OR (petr OR petri))) o.s.*".