What are my options for obtaining a Thai tourist visa after receiving a refusal in Vientiane?

SO...*sigh...trying to plan my next visa run. Planning is hardly my strong side and last one didn't really go so well to say the least. At least it did not go according to plan. Only have myself to blame really as I very well know how the remark stamp, "stamp of doom" as I call it, looks like, but I forgot to all about it. (See pic. The black text should preferably not be there. This is from the embassy in Vientiane.) Just as expected they would NOT issue me any more TR visas there anyway. Correct me if I'm wrong but the easiest and most logic option now feels like trying the Embassy in Hanoi, Vietnam as I stay in BKK. I have 8 pages left in my passport. So I should be fine. One again correct me if I'm wrong. What are the chances that they deny me a TR there as well based on too many in my passport? I had to use one of my two yearly VOA (visa exempt I think its called) to get back in to Thailand last time. Never been to Hanoi so any dos and foremost DON'TS would be well appreciated. Thank you!