Perhaps you should try some spelling variations:
petriv » petri (Expand Search), peteriv (Expand Search), petriiv (Expand Search), petruiv (Expand Search)
peteru » peter (Expand Search), petru (Expand Search), peters (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petriov (Expand Search), petruov (Expand Search)
petris » petri (Expand Search), peteris (Expand Search), petriis (Expand Search), petruis (Expand Search)
petriov » peteriov (Expand Search), petriiov (Expand Search), petruiov (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 ((petriov OR petriv) OR (peteru OR ((petrov OR (petris OR peterio)) OR (petr OR per)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petriv) OR (peteru OR ((petrov OR (petris OR peterio)) OR (petr OR per)))) o.s.*".