Perhaps you should try some spelling variations:
petrov » petro (Expand Search), petriov (Expand Search), petruov (Expand Search), petroov (Expand Search)
petriuv » petriiuv (Expand Search), petruiuv (Expand Search), petroiuv (Expand Search)
petruiuv » petriuiuv (Expand Search), petruuiuv (Expand Search), petrouiuv (Expand Search)
petriiov » petriiiov (Expand Search), petruiiov (Expand Search), petroiiov (Expand Search)
petriuov » petriiuov (Expand Search), petruiuov (Expand Search), petroiuov (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 ((petriuv OR petruiuv) OR ((petriiov OR (petriuov OR petrov)) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuv OR petruiuv) OR ((petriiov OR (petriuov OR petrov)) OR (petr OR peter))) o.s.*".