Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petriiov (Expand Search), petruiov (Expand Search)
petroov » petrov (Expand Search), peteroov (Expand Search), petrioov (Expand Search), petruoov (Expand Search)
petrouio » peterouio (Expand Search), petriouio (Expand Search), petruouio (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petru (Expand Search)
petriuui » peteriuui (Expand Search), petriiuui (Expand Search), petruiuui (Expand Search)
peteri » peterdi (Expand Search), peter (Expand Search), petri (Expand Search)

Try widening your search to All Fields.

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 petroov) OR (petrouio OR (petr OR (peteri OR (petriuui OR peteri))))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petroov) OR (petrouio OR (petr OR (peteri OR (petriuui OR peteri))))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR petroov) OR (petrouio OR (petr OR (peteri OR (petriuui OR peteri))))) o.s.*.