Ok, so my problem is that when you use a raw html block the text written inside it is coded (rightly because is raw) and this is the motif I cannot find nothing written inside it using the database.
For example, if you write (as my case) using the [spb_raw_html] shortcode this text:
<div class="container_pdf"><a href="http://quicktest.it/wp-content/uploads/2014/10/Quick-Fertility-Kit.pdf" target="_blank"><i class="fa fa-download"></i> scarica il PDF</a></div>
it is converted in:
PGRpdiBjbGFzcz0iY29udGFpbmVyX3BkZiI+PGEgaHJlZj0iaHR0cDovL3F1aWNrdGVzdC5pdC93cC1jb250ZW50L3VwbG9hZHMvMjAxNC8xMC9RdWljay1GZXJ0aWxpdHktS2l0LnBkZiIgY2xhc3M9InBkZl9idXR0b25fZ2luZWNvbG9naWEiIHRhcmdldD0iX2JsYW5rIj48aSBjbGFzcz0iZmEgZmEtZG93bmxvYWQiPjwvaT4gc2NhcmljYSBpbCBQREY8L2E+PC9kaXY+Cg==
Inside the post_content column of wp_posts table.
Thanks for feedback