Perhaps you should try some spelling variations:
petriuov » petrov (Expand Search), peteriuov (Expand Search), petriiuov (Expand Search), petroiuov (Expand Search)
peru » per (Expand Search)
periov » petriov (Expand Search), perov (Expand Search)
peri » petri (Expand Search), per (Expand Search)
petrouiov » peterouiov (Expand Search), petriouiov (Expand Search), petroouiov (Expand Search)
petru » peteru (Expand Search), petriu (Expand Search), petrou (Expand Search)
petr » peter (Expand Search), petri (Expand Search), petro (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 ((petriuov OR (periov OR petrouiov)) OR (((pero OR (petru OR peru)) OR peri) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriuov OR (periov OR petrouiov)) OR (((pero OR (petru OR peru)) OR peri) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriuov OR (periov OR petrouiov)) OR (((pero OR (petru OR peru)) OR peri) OR petr)) o.s.*.