Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petrui » peterui (Expand Search), petriui (Expand Search), petruui (Expand Search)
petruv » peteruv (Expand Search), petriuv (Expand Search), petruuv (Expand Search)
petriiv » peteriiv (Expand Search), petriiiv (Expand Search), petruiiv (Expand Search)
petriiuiv » peteriiuiv (Expand Search), petriiiuiv (Expand Search), petruiiuiv (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (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 ((peteruuuov OR petrov) OR ((petrui OR (petruv OR (petriiv OR petriiuiv))) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((peteruuuov OR petrov) OR ((petrui OR (petruv OR (petriiv OR petriiuiv))) OR petr)) o.s.*".