Who are the importers?
Vietnam builds a lot of housing, factories and infrastructure, and its building-hardware and construction-materials market is served by local distributors and trading companies that import fasteners, door hardware, steel and similar products, mostly from China and other Asian suppliers.
Buyers are usually Vietnamese-language businesses, so a short introduction in Vietnamese with product specifications and standards (and ideally a price in a stated currency) is easier to act on. Typical channels are the distributors' websites and business directories, construction and building-materials trade fairs, and Zalo or email.
Note on this result: this was the one topic that filled the full count, but the list mixes true importers with steel makers and manufacturers, so check each company before you write.
How can I reach them?
You describe the buyers you want in plain language, as in the query above. RenewSell turns it into a Target with up to five criteria, checks every candidate against each criterion separately, and shows a cited source for each verdict. Searching and checking are free; a company is charged (5 credits) only when it meets every criterion.
From there you can look for contacts at the companies you want, then write through your own mailbox (Starter plan and above) or through your own LinkedIn or WhatsApp account (Scale plan and above). Nothing is sent until you publish an outreach plan, and each contact receives one cold message per channel.
Cold email rules differ by country. RenewSell does not add an unsubscribe link or your company details to messages, so put them in your own template where the law of the buyer's country requires it.