I will inform you about the requirement document, I have already checked and that we don't have the documents you need because we don't need the documents you mentioned and we can export the goods to Vietnam at all.
And about the open LC, Please see the attached for your files. and you must to see copy LC document in 46A-8 mentioned phytosanitary certificate, I have notified from financial officer that you must to amend LC for delete this message.