<apex:page controller='bulk_controller' applyHtmlTag='false' showHeader='false' renderAs='PDF' >
<html>
<!-- ... existing code ... -->
<body>
<div>
<!-- Add debug statements to check values -->
<p>Debug: {!oppo}</p>
<p>Debug Account Name: {!oppo.Account.Name}</p>
<p>Debug Total Amount: {!totalAmount}</p>
</div>
<!-- ... existing code ... -->
</body>
<!-- ... existing code ... -->
</html>
</apex:page>
https://mydomain.vf.force.com/apex/myvfpageName?parm1=xx&parm2=yyy