Zoho do not list all the e-mails sent or received to/from a especific e-mails adress or especific subject.
For exemple, when I search all the e-mails sent to
daniel.abood@vale.com, zoho didn't find the e-mail "Relatório de Despesas de Viagem - contrato 5900030904 - treinamento Tellus", sent on setp 28th, even I search for the subject or part of it.