Perhaps you should try some spelling variations:
petriv » petris (Expand Search), peteriv (Expand Search), petroiv (Expand Search)
petru » pentru (Expand Search), peteru (Expand Search), petrou (Expand Search)
petrov » petro (Expand Search), peterov (Expand Search), petroov (Expand Search)
petr » peter (Expand Search), petro (Expand Search)
petri » peteri (Expand Search), petroi (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search)
peters » peter (Expand Search), petersen (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 (petriv OR ((petru OR petrov) OR (petr OR (((petri OR peteri) OR peters) OR per)))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (petriv OR ((petru OR petrov) OR (petr OR (((petri OR peteri) OR peters) OR per)))) o.s.*".