Perhaps you should try some spelling variations:
"pacheco a., ivan c." » "pacheco y., ivan c." (Expand Search), "pacheco ana., ivan c." (Expand Search), "pacheco max., ivan c." (Expand Search), "pacheco a., ivan m." (Expand Search)
"pacheco a., ivan k." » "pacheco y., ivan k." (Expand Search), "pacheco ana., ivan k." (Expand Search), "pacheco max., ivan k." (Expand Search)