Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petriiov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petriuo (Expand Search), petruuo (Expand Search), petrouo (Expand Search)
petriuuov » petriiuuov (Expand Search), petruiuuov (Expand Search), petroiuuov (Expand Search)
petriiuo » petriiiuo (Expand Search), petruiiuo (Expand Search), petroiiuo (Expand Search)
petroio » petrioio (Expand Search), petruoio (Expand Search), petrooio (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 petriuuov) OR (((petruo OR petriiuo) OR petroio) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petriuuov) OR (((petruo OR petriiuo) OR petroio) OR (petr OR peter))) o.s.*".