Perhaps you should try some spelling variations:
petrov » peterov (Expand Search), petriov (Expand Search), petroov (Expand Search)
petriuuov » peteriuuov (Expand Search), petriiuuov (Expand Search), petroiuuov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petriu » peteriu (Expand Search), petriiu (Expand Search), petroiu (Expand Search)
petriuo » peteriuo (Expand Search), petriiuo (Expand Search), petroiuo (Expand Search)
petr » peter (Expand Search), petri (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 (peterv OR ((petrov OR petriuuov) OR (((petru OR petriu) OR petriuo) OR petr))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop (peterv OR ((petrov OR petriuuov) OR (((petru OR petriu) OR petriuo) OR petr))) o.s.*".