Perhaps you should try some spelling variations:
petrouv » petrov (Expand Search), petruouv (Expand Search), petroouv (Expand Search), perouv (Expand Search)
petriov » petrov (Expand Search), petruiov (Expand Search), petroiov (Expand Search), periov (Expand Search)
petrioiiov » petruioiiov (Expand Search), petroioiiov (Expand Search), perioiiov (Expand Search)
petri » petrui (Expand Search), petroi (Expand Search), peri (Expand Search)
petrooui » petruooui (Expand Search), petroooui (Expand Search), perooui (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 ((petrouv OR (petriov OR petrioiiov)) OR ((petri OR petrooui) OR (petr OR peter))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR (petriov OR petrioiiov)) OR ((petri OR petrooui) OR (petr OR peter))) o.s.*".