Perhaps you should try some spelling variations:
petriov » petrov (Expand Search), peteriov (Expand Search), petruiov (Expand Search), petroiov (Expand Search)
petruuiuiov » peteruuiuiov (Expand Search), petruuuiuiov (Expand Search), petrouuiuiov (Expand Search)
petr » peter (Expand Search), petru (Expand Search), petro (Expand Search)
petroi » peteroi (Expand Search), petruoi (Expand Search), petrooi (Expand Search), petro (Expand Search), petrov (Expand Search), petrow (Expand Search)
petroooi » peteroooi (Expand Search), petruoooi (Expand Search), petrooooi (Expand Search)
petri » peteri (Expand Search), petrui (Expand Search), petroi (Expand Search)
peterov » petrov (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 petruuiuiov) OR (petr OR (((petroi OR petroooi) OR peterov) OR petri))) o.s.~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "fop ((petriov OR petruuiuiov) OR (petr OR (((petroi OR petroooi) OR peterov) OR petri))) o.s.".
• Adding a wildcard symbol may retrieve word variants: fop ((petriov OR petruuiuiov) OR (petr OR (((petroi OR petroooi) OR peterov) OR petri))) o.s.*.