Perhaps you should try some spelling variations:
petrovov » petrivov (Expand Search), petruvov (Expand Search), peterovov (Expand Search), petriovov (Expand Search), petruovov (Expand Search)
petrov » petriv (Expand Search), petruv (Expand Search), peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petro » petri (Expand Search), petru (Expand Search), petero (Expand Search), petrio (Expand Search), petruo (Expand Search)
petruov » peteruov (Expand Search), petriuov (Expand Search), petruuov (Expand Search)
petruvov » peteruvov (Expand Search), petriuvov (Expand Search), petruuvov (Expand Search)
petriui » peteriui (Expand Search), petriiui (Expand Search), petruiui (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 ((petruov OR (petrovov OR (petruvov OR petrov))) OR (petriui OR (petro OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petruov OR (petrovov OR (petruvov OR petrov))) OR (petriui OR (petro OR petr))) o.s.*".