Perhaps you should try some spelling variations:
"fop petrv OR petriiv OR peterv OR peteruv OR petro OR per OR petr o.s.*" » "fop petrv OR petriiv OR peterv OR peteruv OR petrov OR per OR petr o.s.*" (Expand Search), "fop petrv OR petriiv OR peterv OR peteruv OR petri OR per OR petr o.s.*" (Expand Search), "fop petrv OR petriiv OR peterv OR peteruv OR petru OR per OR petr o.s.*" (Expand Search), "fop peterv OR peteriiv OR peterv OR peteruv OR petero OR per OR peter o.s.*" (Expand Search), "fop petriv OR petriiiv OR peterv OR peteruv OR petrio OR per OR petri o.s.*" (Expand Search), "fop petruv OR petruiiv OR peterv OR peteruv OR petruo OR per OR petru o.s.*" (Expand Search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: fop (((petrv OR petriiv) OR peterv) OR (peteruv OR ((petro OR per) OR petr))) o.s.*.