Crucial in your spouse settlement application to submit:
Evidence of 6 months payslips (which you are already aware) + the corresponding bank statements.
(The most recent shouldn't be any older than 28 days on the date you submit the application).
A letter from your husband's employer on company letterhead confirming the employment is ongoing and/or a copy of his employment contract
Marriage certificate and evidence of a genuine relationship (photos etc) + contact between you while you are apart.
Adequate accommodation available on your return. (
Is your husband living in rented property and is this shared with others)
You need A1 level English from an approved test provider (unless you have a degree taught in English)
https://www.gov.uk/government/uploads/s ... entres.pdf
If you're applying in Vietnam, you will need a TB test certificate
https://www.gov.uk/government/publicati ... in-vietnam
In addition to the £1195 application fee you will have to pay the £600 NHS surcharge.
https://www.gov.uk/healthcare-immigrati ... n/overview