Perhaps you should try some spelling variations:
petrouv » peterouv (Expand Search), petruouv (Expand Search), petroouv (Expand Search)
petriov » peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
petruoi » peteruoi (Expand Search), petruuoi (Expand Search), petrouoi (Expand Search)
petrooui » peterooui (Expand Search), petruooui (Expand Search), petroooui (Expand Search)
petr » peter (Expand Search), petru (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 ((petrouv OR (petriov OR peteriiov)) OR (((petri OR petruoi) OR petrooui) OR petr)) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petrouv OR (petriov OR peteriiov)) OR (((petri OR petruoi) OR petrooui) OR petr)) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petrouv OR (petriov OR peteriiov)) OR (((petri OR petruoi) OR petrooui) OR petr)) o.s.*.