Welcome to the Forum, David. Very nice blades. I'm ignorant about mandau (other than being able to recognize them), so I can only comment on the dha.
The first is of a type I have never seen before. Laotian is plausible. I think the handle is too long for it to be Burman, though it could be Shan.
The dagger is a Shan dha-hmyaung, eastern Burma or northern Thailand.
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