Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petriuo » petriiuo (Expand Search), petruiuo (Expand Search), petroiuo (Expand Search)
petruuo » petriuuo (Expand Search), petruuuo (Expand Search), petrouuo (Expand Search)
petriiiuo » petriiiiuo (Expand Search), petruiiiuo (Expand Search), petroiiiuo (Expand Search)
petruiiuo » petriuiiuo (Expand Search), petruuiiuo (Expand Search), petrouiiuo (Expand Search)
petr » petri (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 (petriov OR ((petriuo OR (petruuo OR (petriiiuo OR petruiiuo))) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriov OR ((petriuo OR (petruuo OR (petriiiuo OR petruiiuo))) OR (petr OR peter))) o.s.*".