Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petero » peters (Expand Search), petro (Expand Search)
petruo » petru (Expand Search), petro (Expand Search), petruuo (Expand Search), petrouo (Expand Search), peruo (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petrooi » petruooi (Expand Search), petroooi (Expand Search), perooi (Expand Search)
petr » petru (Expand Search), petro (Expand Search), per (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 ((petri OR petrooi) OR petrooi)) OR ((petero OR petruo) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR ((petri OR petrooi) OR petrooi)) OR ((petero OR petruo) OR (petr OR peter))) o.s.*".